I use Yubico Security Keys as passkeys. One at home, one in my office, one on my person. All with a local PIN lock (and 10-failure-device-reset) so simply having the hardware is insufficient to log in.
The only annoying thing about this setup is having to manually add each key to each new passkey-enabled account I have.
Yeah I have yubikeys, the problem is that most of the services I use don't offer to enroll more than one. Also there's the issue of limited slots on each key for passwordless.
I like the whole idea of syncing a single key. But the whole chain must be owned by me and me alone.
The only annoying thing about this setup is having to manually add each key to each new passkey-enabled account I have.