I don't think that will work. But once you get familiar with the MDI (Manual Data Input) function of Mach4, you won't miss the cranks. Just tell it where you want it to go and how fast, and it goes there. People always think they'll still want to crank once they've done a CNC conversion, but they get over it. If you really want the thing to act like it's being cranked, implement a MPG (Manual Pulse Generator), which is something Mach4 does support.