Maybe if you store them on a free site with your own private page (or whatever) and list the access to your specified work (ie. " a code") as the listing and send digitally from that site. I don't know. Just a thought.
Yeah, that does suck. I wonder how you could get around that. I haven't read all the rules for listing but I do know that I couldn't give my photography the option of digital delivery to go with or without prints.