Have a yak to the guys at High Modulus about Efoam and the like. They use structural foams and stuff for building trick racing yachts (Xana/Konica Minolta etc) They may not know exactly what you are talking about but may be able to put you on the track.
Another option is make your own - Forman Insulation sell 2 pack insulating foams that are bound to be adjustable for density / finish. It won't be cheap as one of the parts comes in a 9kg LPG bottle but it may fill your need.
If you think you can, or you can't, you're right...
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