Does anyone remember having a copy of internet explorer that the bank required (or chrome these days) but using firefox for everything else? Apply that concept to a phone.
Luckily, here in the U.S. this is still possible. I run Graphene on a Pixel without Play Store compatibility layer and everything just works. Most of my apps come from F-Droid, with the notable exception of Whatsapp, for which a standalone APK is available. Unfortunately, it is proving difficult to get rid of Whatsapp entirely because of friends and family.
If not that frequently or unpredictably then you could just plan to use your laptop for banking some time during the day.
I almost do, yes. Life's complicated, I use several bank and credit card services a day. I'm not at home at suitable times for my banking needs. And payments for purchases sometimes require confirmation in real time via phone app.
> If not that frequently or unpredictably then you could just plan to use your laptop for banking some time during the day.
I used to do that years ago back when it was an option.. But these days, 3 banks I use (two for business) require using their mobile app to authenticate login on a laptop browser. There's no other option.
One of the card apps I have to use often won't even run when Android developer mode is enabled, which is quite annoying.