I found two sites that let you import your rooms and keep working on them.
ACT II
This is made from the developers of InkInc and the Invention Tower, and hence the name, it is meant to be not the end of your Rec Room journey, but “Act II.”
They said it’ll have VR support (judging by the Meta Quest logo), but I just don’t see it on the Quest store yet, but I hope they do.
Nilo
Now this one, is made by @Meriesa, and it is mainly a generative AI game creation site, but it also lets you edit your room files.
Honestly, I like the fact you can edit your rooms, but with all the AI tools, it’ll just end up being ai slop.
I also found a page on The Models Resource to download all the RR assets from the game.