Thank you. I guess that works, though it's a little strange. If you select all the cards in one contact list, and send them as a message or export them as a multiple vCard, it oddly titles the multiple vCard by the name of one random person in the list (e.g "Joe Blow and 13 others"). When I select and try to open the multiple vCard, it doesn't seem to want to let you expand them into individual vCards, but just offers to add them all to the contact list. I suppose that makes sense in that if I wanted individual vCards, I could just pull them out individually, and it does simplify the list import job for the recipient.
I guess I would have thought that if you wanted to share a list of contacts, it would share all the individual vCards in the list, though that might make importing them more challenging.
So yes, that does the trick, but in a slightly unexpected way.