Surprisingly painless! Thanks.
Eurghhh... Unrelated:
I renamed an item I already owned, so now my inventory is throwing a fit. Looks like even though we can rename items, we really can't - with the way the system works, it checks if an item exists by its name instead of by its id.
So now I have to go into the database and edit by hand every instance of that item in adopts_inventory for all users to the new name, else their inventories will throw an error.