OpenBSD FDE: Protect with keydisk + passphrase

Hi misc,

In the past, I used to mount a secondary drive into /mnt/, the keydisk
protected by a password.

Now I use FDE with a keydisk, but would like to protect the bootable
system with a keydisk + passphase (something you have + something you know).

Any chance doing this directly using bioctl ?

-fm