For the immediate future, I'll be all set with GrapheneOS.
Beyond that, I'll suffer whatever inconveniences I need to in order to avoid this bullshit. If that means I can't use my banking apps, I'll find a better bank, or use the web site, or just say "fuck it all" and stop banking on my phone altogether. I've already given up NFC payments. It's not the end of the world.
This will only become a bigger pain in the ass as time goes on, I'm sure, but I will die on this hill. I suggest that everyone draw their lines in the sand sooner rather than later.