i'm getting one android to just do my banking and occasionally do navigation with all radio off in both cases
my "degoogled" phone i already have it, it has a screen with like 2 rows of 12 characters, old school LED array, i forget what they are called, too long ago i first had one (before AMOLED). it's about the size of your thumb and can only do voice and sms
i just have been trying to figure out how to arrange it... the main problem actually has been the way these batteries are built in and when you leave them plugged in all the time, they literally inflate with hydrogen and are at risk of catching fire
so i'm rooting the bank terminal device, and installing a battery charge regulation app that keeps it from ever going over 80% and that should prevent the thing swelling... and the dumb bank gets their small task of maintaining their one terminal system, so i am relegating it to not being my phone at all, just a dumb brick in the corner sitting on top of my computer case