I see, I can implement a callback to hide other boxes when a new one is activated, that would atleast show only one input box at a given time

Also I don't want the addresses to get in the way, so wouldn't really know where to put them if not at the bottom

Thanks, if you'll post when you've updated I'll be happy to give it a shot.
You could always have a tab for support/donations. Not invasive but still visible.