Honestly I would love a twinning route that didn't end the game, you're just stuck as someone else. Maybe Richter turns you into a copy of Rhianna since the real one doesn't want to be a princess, or there's a route where Reese/Matthias turn you into a copy of Magnificence, then work to convince everyone else that Lewis is the real magnificence as a way of getting their mother out of power or something like that :P