OK, quick followup:
Using the code detailed in the post above, and placing it into a .xml file in the mods folder did NOT work. Procipinee simply disappeared entirely as an option to pick r.e. Sovs to play with.
Placing the new items (found in the Mods folder) into Sovereign_Procipinee's.xml in the CoreUnits.xml file in the /English folder did NOT work.
What DID work was:
Copying the entire CoreUnits.xml entry for Procipinee to a new file, placed in the mods folder, with the <AutoCreateEquipment>Token_Bacco</AutoCreateEquipment> tags added to her .xml. The items showed up in Procipinee's description, and were usable ingame.
SOOOO, what do I think I've learned from this little experiment?
If you are going to customize a core Sovereign, you need to copy the ENTIRE code for said sov over to the Mods folder. Note that I didn't try to delete or change any of her other values yet (will do so now, if issue arises I'll post again).
So, TempleDan, I still suggest that you NOT use your DT prefix, and go with Potions_ and Scrolls_ instead and see if that works. Also, Copy all of Procipinee's code over to the Mods folder. Let us know if it works out.
The Potions_ thing might explain a little thing I've seen ingame... Have you ever wondered, looking at the .xml, why say the Potion of Healing disappears when used, but Bread and Tilda Herbs don't, which lets you use those items once each combat?
The .xml for these files are almost exactly identical, so what tells the game to consume the potion bot not the bread? Well, looking at the .xml, Internal Name="Bread" does not have a Potion_ prefix, but pretty much all of the consumable potions do...