Step one - move the back wheel to the front since its got the sprocket.
Step two - add second sprocket to the front wheel (other side maybe)
Step three -add sprocket to the spindle/chuck/spinny bit
Step four - use chain to connect sprocket 1 and 2 (pedals to front wheel), use another chain to connect 3 and 4 (front wheel to chuck/spindle/spinny part)
You
should be able to get all the bits you need off old bicycles and you'll be facing the work piece so it should be a one person operation. Might not be super fast, but you could get say a geared sprocket and gear controls, it might end up being quite nice.