EAP-GTC & Yubikey

I've been attempting to integrate yubikeys with freeradius and have had great success with the included yubikey module authenticating against both stored aes keys and a private otp validation server. However I am now attempting to use them in conjunction with EAP-GTC and am slightly lost. Under the gtc section of the eap module config i see that a user password is returned from the connecting client and passed onto another module for authentication. Is it possible to then pass this to the yubikey module to extract the otp portion, authenticate the otp and then continue with PAP authentication using the users password? Is there another way i should be going about this?