It's been done Vlad, I know of three Baron users that have mounted the control box underneath the arm-rest then mounting the module above the hand-grip. Scott, Paul MV and myself.
It's kind of a touchy mod because the ribbon connecting both module and mother board is extended but otherwise can be done. And yes the toggle switch is remounted as well, Over all the unit will be better balanced swing like a feather, I've done a couple myself and even have Scotts old mod the Yellow Mad Max.
Below in the pic are three Baron mods, Each having one of the three modules installed. The first two left to right can use any of the three modules, my recent mod the unit to the right is currently hard wired for the Goldtrax only but in the near future will add on another harness to include the CoinTrax module face place with LED lights and the push button feature. leaving the module attached with the mother board.
Kind of hard to explain how I'm approaching these baron mods now it's different than the old approach, But for a simplified baron mod I would go with the old approach separating the modules from the mother board connecting the two with a longer ribbon.
Before I forget, The Baron mod to the left used an old alarm clock gutted it out and modified it to hold any of the three face modules and currently has the Pro-Hunter module. Plus, Replaced the main housing with a lighter smaller housing.
Paul (Ca)