What are you using? I think most managers already do passkeys

I was enthused when it first got added to KeypassXC but after a few attempts I couldn't get it working and haven't bothered since. Something fundamentally isn't quite working here and I am not a big fan of the workflow for them its entirely out of my hands and I am not a fan of that.

I don't want to use passkeys until I can chose and verify that they are device bound.

KeepassXC famously has no network sync of any kind and supports passkeys.

Use a hardware token (eg. yubikey) then?

1Password ticks all these boxes.

It doesn't support using the passkeys in chrome for android as far as I'm aware

Okay, but now you moved the goalposts by adding the context of Chrome. It works on Android in Firefox.

Okay. Maybe discuss this with whoever develops your password manager. The tone of your reply has me thinking that you’re using an open-source password manager. Maybe they’ll accept a PR from you?

Passkeys are supported by my password manager of choice, in the OSs that I care about.