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.
KirkMcGee8
