UK Banks: HSBC, Lloyds, Starling, Monzo, etc.
A bank card is far more practical than a second phone. Even if Google Pay did work on GrapheneOS, I would not use it. It looks like a privacy nightmare.
But then I can use it for any broken bank apps too.
Don’t need them. Halifax has online banking in a browser. When they merged with Lloyd’s, they moved systems so I’m assuming it’s the same for Lloyd’s.
Far too slow moving money between accounts while standing at checkout with a queue of people waiting behind you.
You go shopping without money in your account?
Not uncommon to have multiple cards.
No, but to have food shopping budget split amonsts them is illogical.
Are you asking whether you should use grapheneos, your fitbit or a second phone for banking?
I think OP wonders if GPay on Fitbit works on GrapheneOS with his bank, or if he needs another phone to set it up.
Garmin pay, assuming you bank supports it