I'm curious if Next has full support for Cloudflare or if this is the only way to run Next w/RSC off of Vercel.
this is the biggest effort I'm aware to run Next with a full-ish feature set outside of Vercel: https://opennext.js.org/. Supports AWS, Cloudflare, and Netlify. You can also run Next as a normal node webserver. I've only used the Cloudflare integration and it was a bit janky but worked (and seems to be entering 1.0 soon so may be less janky).
AFAIK this is completely unsupported by the Next team, but would love to be proven wrong!