Why is f-droid a no go for you? Obtainium and zap store on my list for sure.
accrescent, obtainium & nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8. A separate profile for Google Pay Services if you must.
not f-droid.
Discussion
even on nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8, best practice would be to only install apps signed by the developer.