The OP hasnt responded yet so i guess ill just add my opinion:
No i would not do that trade. Is it a fair trade? Sure is, if both parties are happy with what they get. From a money standpoint is it a fair trade? No i dont think so. You have to treat the bee as just a bee since the "het hypo" isnt coming from a reputable breeder. (Not saying this guy is a bad person or anything). A male bee, even that size, isnt worth the same as a hatchling female ivory.