Then for more customization we have a setup where devs can just spin up a CodeSandbox link in the browser that imports the Framer component to add more interactivity (like custom hooks etc). Everything is deployed via CodeSandbox.

Devs/Designers/Anybody else just use CodeSandbox links, no editors. People responsible for content use these links to edit .json files inside CodeSandbox repository to quickly add/edit things. New images can be uploaded via drag & drop in and when saving the file it becomes part of the git repo. No CMS needed.

We have a bunch of lock-ins with this setup (like if Framer/CodeSandbox goes down we're f**ed) but I feel like going with anything else there will always be lock-in (AWS, Vercel, some open-source project which is now dead and nobody can maintain anymore).

It's amazingly fast to work this way & we love it.