First, don't destroy your opsec if you feel unsafe. Open source can move forward with contributions from people who can safely contribute.
I would, however, consider sharing enough of the solution somewhere that others can find it. It can wait to join the official answer list until someone else verifies and contributes it - someone who faces less risks for doing so.
Also, as others have mentioned, the real long term answer is to reject banking apps. They're simply do invasive, and the web portals aren't going away until there aren't any more PC users.
I use my work computer and am using my desktop as a sacrificial machine. I feel like if it sits on a desk, it can only share one location point. Finding private apps is on my to do list. I might move funds to another country if there is one left that hasn't become facists yet.
Thinking of the insanity puppy meme.
What about just logging in with your web browser? I've been using GOS for going on 4 years now and haven't had any issues with it. Is there anything specific the app provides that you need that isn't available through browser?
Assuming your bank already has all of your information, what's the problem with them knowing your IP?
And how often do you need to use your banking app? Could you connect from a local free WiFi network from a library or something?
Sorry for derailing... But what was the workaround? Was the issue they used Play Integrity API and you managed to circumvent it?
Why are they explicitly going out of their way to block GrapheneOS despite not many people using it?
You'll probably be fine if you post circumvention info then
You’re overthinking it.
Post whatever you found and just don’t use the banking app.
What do you use it for daily? I think a lot of us don't have to use banking apps very often.