Hi Latexdude,
Welcome to the Mattress Forum! 
There are quite a few zoned latex mattress offerings available, but I don’t keep track of which company is offering zoned componentry at any particular point in time, or who might be willing to order in specific types of foam on a special-order basis. It would be too difficult of a task in an ever-changing market.
Because you have a very specific design in mind, the DIY route might be your best option. The first listings in the component thread here offer quite a few sources for latex. Site member Mattresses.net has some tri-zone Dunlop cores they are offering. FloBeds, another site member here, offers their V-Zone mattress that is quite customizable, but I’m not sure if the design would meet with your needs. A search on zoned latex cores brings up quite a few options as well. These are just a few of the thoughts that immediately come to mind.
You can do a simple forum search on Naturelle (just click on the link) about Naturelle. BBB lists same phone number for Naturelle as is used for Naturelleorganicbeds.ca.
Phoenix