All good ideas, my concern is if I do it wrong it will get locked up and I will have to do way more work than finding an old phone with stock android.
I think I do have an old google account too so good ideas, though I imagine it would want to have access to SMS, right?
(edit)
https://medium.com/@tilaklodha/googl...s-2933a4ece8c2
it seems to need google play....
(edit 2)
I was able to install the google authenticator app onto a tablet with lineageos and microg, it worked for the login, apparently there is also a chromium/chrome app that will work though the app from the aurora store(gets from the google app store) is able to use the QR codes with a camera, not sure about the chromium app.
altogether dirty and I hope to be free of this bank soon, but until then I have a working solution without google play