Set up a shop (i.e. provide equipment and training).
Very good idea. You do not perform gunsmithing you train and provide for the use of machines and equipment.
Kinda like when a new local law required getting a special permit to rent the mother in law unit as a vacation rental. My friend just stopped charging money for the unit and only accepted donations. Of any kind like booze and food and ammo and... Well you get the idea.