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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Myself, I use my bank's web portal via my mobile browser. Not as instant as an app, but it gets the job done.
Culprit is: I need the phones app as second factor to log in to the web interface.
Graphene os + a work profile + sandboxed play services allows you to have some baking apps. Ive got 3 and they all work without a hitch.