Drop into the LogicMods folder to install, requires UE4SS to load.

(From Discord)
To anyone who wants to try it out, you can use this version of my TestBed mod, I've detached all the other junk so it should just have the swapper function.

Aim at an NPC and press the . key (period) and it'll swap the mesh to the player model (female old cloth outfit, head1, hair 1). Note it will just try and swap any character, which will obviously break anything that isn't immediately compatible lol