

There are Google Play Android bank apps (mine works fine), and you can use mobile sites as dedicated app drawer icons. Their mobile site is top notch.
NFC payments won’t come anytime soon to native GNU/Linux, but I don’t use them. Maybe Google Wallet works, I haven’t tried and don’t know if NFC can be passed through to Waydroid. OnePlus 6 is the best supported originally Android phone for GNU/Linux, someone with that would need to test.
I just have my card in a silicon sleeve on the back of the phone and I get the same effect. I’d rather Google not have my purchase history anyways.
Use Briar