Tower/rewind will mesh well. Also, I hate to say this but I've been burned out about your CYOA since it turned to anime (not that I absolutely hate it).
6. Succession: Like in those "continue the story" forum games, each update is written by a different author following the previous one and based on the choices voted in it.
Let's do it.
I'd be interested, yet I can't promise decent quality writing, only a horrible mockery pretentiously feigning as a good quality update.
Witches of course. A.