After giving it considerable thought, I've decided to work on writing the backstory of this whole mess as if I were writing a poor man's The Silmarillion. Nothing that I'll think about publishing, but something that sets the record straight, for me, on the hundreds of pages worth of notes that I have, and the thousands and thousands of hours I've put into creating them.
So that's my goal. And it's going to be in narrative form, not scene outtakes and other useless crap like that. As I said in the post below, either an entire narrative separated by chapters, or as short stories (or novellas - in terms of length).
I'd like to say that I wish I would have done this years ago - and I do! - but I don't think that I would have been ready to. And it's not better late than never - it's best to do it when you're most capable of doing it right. I think I'm closer to that point right now than I've ever been. And it's within reach.