To me the best solution would be for the ticket office to offer you a better seat at no extra charge. You've bought your upgraded seat in good faith. The TO has done the right thing by the late renewer but you shouldn't be penalised because of it.
From reading various posts over the last few years I can't see this working. The support is severely fractured and I can't see the group's agreeing on much. In theory it's a great idea though.
Thanks for the comments. I like the extreme end of HDR. If I'd made it more subtle it would have looked like a lot of images already out there. I've always had a mixed response to that image.