Hi iwriter,
Welcome to the Mattress Forum! 
Much of what you’re asking in your questions deals with me “picking out” or making specific suggestions for you regarding a mattress, which is something that I’m unfortunately not able to do. I can certainly help with “how” to choose, but it’s not possible to make specific suggestions or recommendations for either a mattress, manufacturers/retailers, or combinations of materials or components because the first “rule” of mattress shopping is to always remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort”, firmness, or PPP or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress), sleeping positions, health conditions, or “theory at a distance” that can possibly be more reliable than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
What I can do is make some more general comments on some of the other topics you’ve brought up that you may find useful. First, I’ll recommend that you start your mattress shopping experience with a review of the mattress shopping tutorial here.
What you’re describing is a component-style system, where layers may be chosen and rearranged to achieve different levels of comfort. These systems are quite popular with latex (and sometimes memory foam), and a firm/medium/soft combination is one of the more popular ones. Many of the site members listed here offer such component systems (as well as others online), and if you’re curious about such an arrangement I would recommend a detailed phone conversation with the manufacturer, at which time you can express what comfort level you’re attempting to achieve, and they can ask more question about your physical characteristics that can assist them in making a recommendation of certain layers that they honestly believe will work best for you.
At a similar ILD, Dunlop will tend to feel a bit firmer than Talalay especially in the uppermost layers, as Dunlop “firms up faster” than Talalay when compressed beyond 25% or so has a higher compression modulus).
While other people’s comments about the knowledge and service of a particular business can certainly be very helpful, I would be cautious about using anyone else’s suggestions, experiences or reviews on a specific mattress (either positive or negative) as a reliable source of information or guidance about how you will feel on the same mattress or how suitable a mattress may be for you. In many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your Personal preferences) may be completely unsuitable for someone else to sleep on (even if they are in a similar weight range). In other words, other people’s experiences in general won’t tell you much if anything about the suitability or “value” of a mattress for any particular person (see post #13 here). All latex will tend to be a durable material, so I Would again suggest a phone conversation with a knowledgeable manufacturer or retailer regarding your needs (and information about any all-latex combinations you’ve tested in person) and use their experience and advice.
Per the information I listed previously, this isn’t a “review site” but instead a resource for how to select a mattress, so you won’t find any specific “reviews” on particular mattresses.
You can perform a forum search on Essentia or Bionda here. The Bionda uses good quality Dunlop latex, but you may wish to do some careful value comparisons when considering this product, as it can be in a bit of a higher price point for other items providing “similar” componentry. While price is certainly important of course … the “value” of a mattress purchase is what is most important and price is just one of many factors that can affect the “value” of a mattress purchase. There isn’t a “formula” that can be used to assess or “calculate” the value of a mattress because there are so many different variables and criteria involved that can affect the price of a mattress that can each be more or less important to some people and not to others who may have completely different criteria or definitions of “value”. The value of a mattress purchase is also relative to how a mattress compares to the other finalists you are considering or to other mattresses that are available to you in your area (or online if you are also considering online options). There are many reasons that a mattress that may be “good value” for one person or in one area of the country may not be good value for someone else that has very different needs and preferences or that lives in a different area.
There is more about the 3 most important parts of the “value” of a mattress purchase in post #13 here which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on suitability, durability, and all the other parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
The latex used in that mattress is all GOLS certified Dunlop latex.
Yes, Aireloom mattresses can be quite expensive, but more importantly you need to make sure that you find out the information listed here so you can compare the quality of the materials before making any purchase. Unfortunately you’re unlikely to find out this information as it is not normally provided to consumers (you can use the earlier link to search for information about Aireloom on this site as well).
Much of this will depend upon the softness (ILD) of the latex used within the mattress, specifically the uppermost layer. All latex will be quite resilient, but softer later can be more difficult to reposition on that firm latex. Latex will be easier to reposition upon than memory foam.
As you’re already aware, the Latex Mattress Factory is a site member here and I think highly of their products and advice. If you are considering your own component-style mattress from them, I would strongly suggest a phone call to them directly with your questions and use their guidance on how to achieve a finished product that they think will serve you best.
I know you’ve already looked at some local stores in Kansas City, but just in case you missed a few…subject to first confirming that any retailer or manufacturer on the list you wish to deal with is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of in and around the Kansas City area are listed in post #2 here. There are a few who offer all-latex mattresses.
Phoenix