I love that hand-crank thing. That's beautiful.

I think - to REALLY "solve the problem", you would have to use a roller mill (or a series of them) instead of a burr grinder. Of course, you'd need the ability to adjust the distance between the rollers very precisely, which may not be practical depending upon design and scale.

http://schmidling.com/maltmill.htm

bibere usque ad hilaritatem