Re: Tandem w/ shift kit?
I think your idea should work. My only concern would be the chain from the jackshaft to the stoker crank will be a bit long but it shouldn't be a problem. Now that we have a good selection of chainrings you should be able to get the gearing you like. Oh but you would need a freewheel on the front crank as well or your pedals would be spinning. So you would need freewheels on both cranks.