Mulch, it is available on an fdroid repo from divestOS. Mull can also isolate pages

This repo provides an updated version of Bromite. You can put the link into Obtanium for easy updating (it’s a similar process to updating a F-Droid app).

I don’t have an answer to your question, but if it might help- I recently learned about an app called obtainium that apparently makes it a lot more practical to install apps directly from github, gitlab, etc. and keep them updated.

I hope you find a solution that works for your needs!

Sadly seems like it, and either way I don’t think a security critical app like a browser going ghost mode for so long is acceptable. If you’re using Play or the Aurora store, brave is an option otherwise its only Graphene and Vanadium I’m aware of.