Florida needs to nave a crack at it with lin and long laplaes and red prawn as well.If macrantha and the laplaes yield to the Florida climate then it can't be done.Maybe a highland specimen of a Borneo species is also in the running to fly the Durio flag as well.
Floridians have a lot more difficulty getting that kind of material to experiment with than you do Mike.
Look for example, at the difficulty they had at getting wani. Remember Fruit Hunters movie? In that movie Richard Campbell states they've been trying to graft that unsuccesfully for over 20 years! Then recently got a whole lot more scion wood, tried again, and failed again. Only were able to get wani growing now from cuttings! And this is for Fairchild Gardens, which has paid employees and funding to go fruit exploring and collecting. Imagine the difficulty private collectors would have getting hard to source materials? Not saying it's not possible, just a lot more difficult than you paint it. Australia already has lots more of these rare species growing, and also is a lot closer to native areas where they grow.