I have a triple het project of my own and the way I'm going to do it is make double hets of 2 of the morphs and try to make the double recessive of either of the 3 possible combos then breed the double recessive animal to to single recessive to get your triple hets.

My project will be a Hypo Albino Pied, which if the Hypo Albino is any clue it should be a pure orange and white ball python, with a pied pattern.