Baseplate won't migrate. Parts of Lighting might, depending how it was done. Towbar absolutely should migrate, along with braking unless there are special installation components. If so, you should be able to get just those pieces.
It's the "Must Come Off" part of this that concerns me. Many are looking for a vehicle dressed out as a toad. Especially a JEEP. Those people would pay more for one that had a base plate, not less. Dealer would probably Offer Less then Ask More.
If I'd installed the base plate, I'd probably take it off and sell it, but hiring somebody to do it won't pay back.