Remix is already essentially a Vite plugin + React Router. That change was started at least 9 months ago and went stable 3 months ago.

https://remix.run/blog/remix-heart-vite

https://remix.run/blog/remix-vite-stable

At this point the separation between the two projects is seeming more and more like a lot of rigmarole for nothing. Imagine running two projects that are 90% the same, and every time you change one you have to make a release and update the other, etc etc.