F-droid works on any Android phone, doesnt need to be GrapheneOS. I have installed in on regular installs plenty of times.

i know its not as easy / inconvenient, but is there any way to use the companies website instead of the app? For example, i usually log into my banks website to check things or to make a transfer between accounts. Yes you cant scan a check or make desposits, but i also not use a lot of companies App’s in the first place. I just dont understand why everyone needs apps - do you really need an app for your ISP?