Certificate Authority using ed25519 key on Gnuk?

[Terminada]

Is it possible to set up a self signed certificate authority using a 
ed25519 key protected by a Gnuk (FST-01sz) device?

It appears that gpgsm supports creating a self signed CA but maybe only 
for RSA keys?  I have tried running gpgsm --gen-key but I end up 
receiving this response at the end:

 > gpgsm: error setting the siginfo: Wrong public key algorithm

Is there some way I can get a self signed CA working with a ed25519 key 
on Gnuk?  Do I need to convert the format of the ed25519 private key to 
that wanted by openssl, prior to sending it to my Gnuk?