FWIW, the method in that xeiaso link (using resident keys on a security key) can be done with the cheaper "Security Keys" from Yubico, and doesn't need the more

FWIW, the method in that xeiaso link (using resident keys on a security key) can be done with the cheaper "Security Keys" from Yubico, and doesn't need the more expensive Yubikey. -- The cheaper security key can be used as a FIDO key as 2FA for many websites; or even for stuff like Linux login.