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Making a work profile using Insular or something? Or maybe create a different user?
I believe you can still access internet-banking, without the need for an app?
Maybe, setup MicroG. If the your bank app just redirects you to google play store app, I think Aurora Store might be able to fool it, considering you disable or remove GPlay using adb
or something.
Just looking at that dense crowd while not using terribly large amount of resources is great feeling.