BUNN - G3 HD Bulk Coffee Grinder

Bunn G3 HD Inexpensive, you can find them used for 300 - 500 and they last forever. They are the industry standard for bulk grinding and you can find vairations of them in many grocery stores in the US.

You might research commercial Bunn grinders, G1 or G3. They have a Turkish setting and burr grind/pulverize, but have no idea about microns. They are biggish and not very Kitchen stylish. You can always find some used on FBM or in Restaurant supply houses. It is a purchase for life.

I think this is very doable with some smart shopping. Not sure if it's available to your friend, but a used Bunn G series grinder would be the default option here in the states. Maybe a used HeyCafe 880? When going the used route, it's a great idea to check on replacement burr availability. Nothing worse than checking out a used grinder and smelling the fine aroma of hazelnut wafting from the grind chamber. Those oils can be a real bear to clean up and new burrs may be necessary. ETA: As mentioned, grinding a kilo of coffee for espresso is going to be taxing for most machines and will probably not be the best grind for the customers machine anyway. I would try to avoid it if at all possible.

Agreed. Get a Bunn grinder if your shop grinds beans for customers. Get an EK43 for grind on demand and pour overs