This is how I would try to create a tree replacer for TR maps:
- Load one of the TR maps in the TESCS
- Create a duplicate object for one of the tree statics that are used in the TR map
- Go to Edit > Search & Replace and replace all references for the tree static with the new duplicate object (make sure that "current cell only" is not ticked)
- Repeat steps 2 and 3 for each tree type used in the map
- Save your changes to a mod
- Open the mod in the Enchanted Editor and remove changes to any cells that are not part of the TR map