I've been searching for one but I cannot find anything that I can use all my cards with. This is the number one bummer about GrapheneOS, no Google Wallet really sucks, the app doesn't even open so you cannot use other features with it, not just contactless payments.
In this day and age though not having contactless payment is just enough to make me go "this can never be my primary device". I've got it pretty much down to how I like Android, other than it's missing several customisable things I loved from Samsung phones. The bar at the bottom and the signal bar at the top for example. I wish I could hide them because they often get in the way and I see them burned into my screen.
I'm hoping there is some alternative I've missed for a google wallet replacement though? I do not like having to carry my cards on me as losing them is a risk.