It's been brought to my attention that it works, so I thought I'd share:

A web version of VSCode integrated with github works in Wayfarer (with some caveats). To run, sign in into github, go to your favourite repository and press . (dot). This will forward you to fe https://github.dev/jacadcaps/gamepadlib.

Hint: for editing to work, you need to use a Safari user agent.