https://www.thingiverse.com/thing:6075723 https://youtu.be/KmCcjxr04Fs
My arm was getting tired, so I decided to over-engineer my coffee grinder. It already runs on a standard screwdriver bit hex, so I was actually pretty surprised that nobody else beat me to it.
Yeah, that would solve the biggest problem, which is how annoying it is to hold when you try to use just the drill and grinder.