This is a yes and no answer.
Yes, it does work to start the engine. You place a 14 mm socket on the magneto hex nut and with a drill (powering the socket extension), spin it clockwise. BUT... when the engine fires, the engine crankshaft will begin turning a lot faster than the now-dragging 1800 rpm of the driving socket. The end result: the magneto hex nut UNSCREWS itself right off the threads of the magneto crankshaft and will drop out of your socket and go spinning across the floor into some dark crevass in your shop. It happened to me. (Also, be sure to get a no-slop socket fit, else you will round the edges of the 14 mm hex nut. Then you have to purchase some new hex nuts.)
If someone comes up with a freewheel arrangement like the cassette on the back wheel, he will have himself a unique invention I would seriously consider purchasing. My 2-stroke engined jackshaft bike is a royal pain to start after sitting for a week or better; hence I don't ride it as much as I would like. Being able to start it in a stand in a shop would be worth a reasonable price.
MikeJ