Hi worknman,
I switched your post to a new topic of its own with a different title because it was more of a general question about mattress design than about the BME.
The BME uses Talalay latex in the top layer and synthetic dunlop in the transition layer so I’m assuming that you are asking about what would happen if they replaced the polyfoam support core with a Dunlop latex support core of some type…
It’s not really possible to answer your question specifically because it would depend on the blend of Dunlop that was used, and on the thickness and firmness of the Dunlop as well along with your body type and sleeping style and on how sensitive you are to differences in the deeper layers of a mattress.
Some people may not notice much difference at all while others would notice a significant difference but there is more about the general differences between an all latex mattress and a latex/poplyfoam hybrid in post #2 here.
Phoenix