It sounds like a reasonable starting point but I would keep in mind that latex is nothing like memory foam and they are very different “animals” that will feel very different from each other so you won’t be able to “match” or “approximate” your old Tempurpedic using latex comfort layers. There is more about how latex and memory foam compare in post #2 here but the most reliable way to know which material you tend to prefer in general will be based on your own local testing or personal experience.