Well, I have other posts about it somewhere... all over, probably.
I've long flirted with the idea of Lavos going from a time-hopping, possibly galaxy-traversing being... to one that moves between dimensions. Kind of a way to take things to the next level.
I also wanted to have the sequel star Crono and Marle's children. See this post...
https://www.chronocompendium.com/Forums/index.php?topic=12581.0I also really REALLY like the idea of Schala being the entity Robo posits existing. How beautiful would it be if, after fusing with Lavos, she was able, just barely able, to see the one fighting chance the planet had... by opening the gates and sending Crono and co. on their adventure. (Keep in mind it was her pendant that opened the first one at the fair- a channel, of sorts, that Schala could have tapped into.)
I ALSO prefer to largely disregard Crono Cross's plot because it sucked, in my opinion. Although, if you look at my idea for starting with C/M's kids, I don't disrupt it. Guardia is overthrown, etc.
Now, circling back to your idea, what I like about it is that it isn't just a next-level multiverse Lavos, but keeps things on the same scale, but different, and new and interesting. It also makes me think... what if there were beings trying to undo what Crono and co. did? Like, beings who don't like timelines being messed with? Hell, maybe that ties into a character with amnesia somehow? Someone trying to figure out what "happened" because the timeline being reestablished as the original timeline screwed with his/her mind? Wrong place wrong time kind of thing?
K I'm about to spiral out of control with random ideas, better stop.