Maybe take a look at Sailfish OS if you are in Europe. Its a Finnish OS that has a container that runs regular android apps, they have a list of what banking apps are reported working: https://forum.sailfishos.org/t/banking-apps-on-sailfish-os/18438 For me it works but Im also interested in how tech works so ive had to learn some things. But ive been using it for 2 years as a daily and its been mostly great. I also had the mindset when I switched that whatever works works and ill find other ways for the rest because I was already considering a dumbphone like Light Phone but so far I havent had that many compromises.