Yeah, I always assumed that “female Luke” would just have been called Leia, and that Luke would have become the younger brother or something like that. I haven’t done any “extensive” research of the early drafts, though I’ve read Rinzler’s making of book, and I’ve read the 2nd draft, most of the 4th, as well as the 1st draft comic adaptation, and as far as I know Lucas never actually wrote anything, or at least very little, with with a female Luke, he just one day suddenly told McQuarrie to draw the hero as a girl and then a while after handed in a new draft where the hero was male again. I’m sure someone here can confirm or correct me on this.