2 factor authentication: Yubikey, Fido key, etc

Is anyone using, or seen, 2fa used to secure their admin (or even server cpanel) as required for compliance?

My wish list would include yubikey or FIDO key before the cellphone text message variants.

I just completed an SAQ-A online and the form required a "Yes" check in the 2FA box. That was for version 2 and the requirements seem to get much more demanding when the V3 forms become more mainstream in 2015.

I just bought a yubikey for my server. Would be nice if there was a way to integrate it into admin.

Zencart implementation guide in the docs folder has the "how to" instructions that are above my paygrade. Section 10.5

Interesting read. Looks doable.