Here's what I'm trying to do:
A friend of mine has written some TES fanfiction and would like me to add it to the game for him. I've already gone ahead and added the book to the appropriate levelled lists, but he would also like Urag in the College to sell the book. The easiest approach would be to modify Urag's merchant container, but I don't want to do that, as I know from previous TES modding that this will conflict with any other mods that do stuff with his container, and that's not really fair for the simple task I'm trying to do.
So instead I tried adding a container to the shop and assigning it to Urag's ownership. Of course, that didn't work either because of the new vendor system tied into factions and stuff that exists in Skyrim.
I read up on how to do it correctly and decided to try creating a new "Vendor" faction, choosing my container as the merchant container, then adding Urag to this faction (in addition to his existing faction)
No dice. The new items don't appear in his inventory.
I copied Urag's original vendor faction and only changed the merchant container ID and the name of the form, so it should work, if it's possible.
IS it possible for a merchant to be assigned to more than one vendor container?
If so, how do I do it? I'd like to do this in the cleanest way possible, without editing things that are likely to have already been edited by other mods.

