There's nothing stopping you from attaching a drill to the corona mill. I did it with mine. If that's all thats forcing you to think of upgrading mills, then just head to HD/Lowes and grab some threaded rod that's the same threads as the handle that fits in there. The drill chuck will grip the threads pretty easily. you can grind a couple flat spots if it helps too. One thing I think I've heard before is to put two nuts on the threaded rod so that it doesnt bottom out when you screw it into the mill. If it does, as you mill you'll keep tightening it to the point it'll be nearly impossible to remove if you ever wanted. FWIW I got my mill working pretty well just like this one: http://www.homebrewtalk.com/1308996-post144.html
I just didn't get to the point of putting the water bottle on top. I just used the hopper inluded with the mill.