Elliptic curve signatures are even easier since they're computationally less efficient and can be implemented in software on newer smartcards!
I'm using a GPG key on my Yubikey, and while I haven't tried using Ed25519 and Curve25519 in particular (GPG support for these is still not ubiquitous), the GPG smartcard application in general works quite well for both SSH and actual OpenPGP use.
I'm using a GPG key on my Yubikey, and while I haven't tried using Ed25519 and Curve25519 in particular (GPG support for these is still not ubiquitous), the GPG smartcard application in general works quite well for both SSH and actual OpenPGP use.