Things may have changed but I remember looking 6 years ago for alternatives and on Samsung phones they didn’t work. Their Knox security implementation really busted the ROM community on Samsung phones.

I’d recommend looking at alternative OS sites and checking their supported devices lists and see what brand seems best supported. I remember One plus worked well in the past. Not sure about current phones.

Yea it can be tricky. If you have the time to test it out its worth the privacy upgrade.

Just be sure you have an accurate image of your default OS, for your carrier if applicable, so you can revert.

Privacy Guides.org

This is a great site to see recommended products for use like proton and their alternatives.

While Proton does offer a lot of services that are useful, some people dont want to put all their eggs in one basket and use various products together.

GrapheneOS has the option to run sandboxed google play services which you can then download any google play store app. This allows for much greater security as the apps cannot see the other apps you download. Also, you could use Aurora Store which allows play store app downloads without a google account.

There are issues that can pop up and is something you’d need to look into on app by app basis. Lately, it seems they have most banking apps working though.