Is there no way to open the case to disable the contacts?
I would temporarily deactivate the side buttons from the outside.
The whole thing is surreal. I can’t imagine for the life of me why you would want to deactivate the side buttons on a PC mouse.
Perhaps you should train your fingers using the Bates method.
Okay, Bates was an ophthalmologist, but he certainly knew a thing or two about fingers too. 