More or less my sentiments exactly. I'll probably lop off Luke's dumbass noggin' (and neck) and add a headsculpt that I feel looks "young" and appropriate to the body. The current Star Trek figures I feel look pretty good with the Luke body giving the flight briefings a little variety in height. The helmet will need a splash of paint though I guess.
That's been my plan with Red Leader figures, till I get a new body to swap his noggin onto anyway.