When I first got back into SW collecting, vintage was all there was, and I stocked up on XW Lukes to do some repainting/customizing. Removable helmets were fun tests of my earlier dremel skills, and giving the helmets paintjobs like Wedge's or generic blue emblems was fun stuff.
Luke made a decent army builder then in, in that regard, at that time.
VTSC Luke is, to me, pretty perfect... A new headsculpt is all I'd do.
VTSC Luke Pilot is short because Luke Skywalker was short... So I see no need to heighten him any. The likeness is the only real question, which I'm not against the likeness we have even. I'd dig seeing a dirtier helmet like the POTJ one, as that's quite accurately decorated.
Color me pretty pleased with VTSC Luke and considering that one done though.