I don't know how do you imagine a typical 'SSH user' looks like, but no company is out there racing to disrupt that particular field. There won't be a security key provider that cares enough to follow WebAuthn spec, but then decides to be lax about SSH usage for user convenience.

EDIT: looked into it a bit more and it appears that truth is somewhere in the middle. I didn't test it, but it's possible that as long as every chain link is fine with it you can opt-out out of user presence check.

https://wiki.archlinux.org/title/SSH_keys#FIDO/U2F

https://man.archlinux.org/man/sshd.8#no-touch-required

You need to have a SSH server that agrees to it, SSH key that is specifically made for this use case and maybe a security key that allows it to proceed. Probably worth testing if I find the time for it.