Well you've at least managed a "confess" possibility that isn't completely insane, which is rather a feat. Of course, Dumbledore and some others know about the Occlumency thing, which means that there's a rather gaping hole in the explanation. Also, he took months to come forward, which is sketchy, and he said not five minutes earlier that he didn't know whose plot it was. Also, everyone thinks Voldemort is dead, and I didn't think an Imperius could be broken in the HP universe. Still, it's an improvement on that line of thought.