Fascinating. I think I prefer this to JKR's choice of an ending. No, actually, I'm pretty sure I do prefer it. Harry is so normal of a boy with such an extraordinary burden to bear that it's almost too much to believe that he can come out of everything a shining, unblemished hero. And especially if he's infused with all that power, both Dark and Light and definitely Wild. This take reminds me of a Snarry I read last year for another fest which also builds from the idea that Harry's absorbed too much of the Death Eater's powers, including Voldemort's, to stay entirely sane. Makes perfect sense to me.
Your writing is intense to the point of eroticism. I loved reading this and tasting every word.