Hi jege41,
The latex would be more breathable than the memory foam and it will also “firm up” or at least “slow down” the memory foam to some degree but FBM sells Dunlop which is less breathable than Talalay (even though they claim to sell Talalay).
I think it will certainly “help” to some degree but only you can really decide if it will help “enough”. Some of the other factors involved in temperature regulation are in post #2 here which may be helpful as well.
Phoenix