It is setup, and comes with a Flange bearing spacer if you don't want to use a C-face motor. The Bearing spacer bolts to where the c-face would bolt (backside), and the square is cut out to fit standard size flange bearings on each side of the bearing spacer. Which makes the drive shaft from the bearings line up exactly where the drive shaft would have came out if using a c face. So short answer yes you can use a 3 step pulley system. I'll try and take more pics. But it works pretty good. I'm going to upload some better videos.
Thanks
Wil