The 'tragedy of Darth Vader' stuff doesn't fit at all with the way the original films were written at the time they were made: it's all revisionism imposed upon them decades after the fact. Star Wars is very much 'the adventures of Luke Skywalker' at its heart.
What I've suggested is one of the only viable solutions to the problem suggested in the first post. To pose this question and then ridicule the answers received is a useless and inane waste of everyone's time.
Incidentally, when my author friend rewrites the prequels to be consistent with the original trilogy next year, that's how he's going to do it.