I am a huge advocate of the PC, but I think claying with one is a BAD idea. claying should be done by hand. The feedback, both in terms of drag and noise, is really vital to using it well. It would be easy to over-clay with the orbital, to expose the exact same clay surface for too long, and to run low on lube, leaving clay smear behind before you had a chance to react.
Claying generally only needs 2-3 strokes over an area, and doesn't need heavy pressure - so it is easily done by hand.