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).

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

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.