>I’m slowly going more and more down this route but I’m curious about what you or others are using for banking apps and parking payment apps. I actually want to switch to graphene OS but there are always these rare corner cases.

I'm too busy right now, but I think my medium-term plan is to get a local bank and just use them locally like the old days. I'm stuck on iPhone for a variety of reasons, but I'd still like to get my app count down as much as possible. Plus if my phone falls into a river I'll still be able to do my banking. I think the convenience hit will be worth it.