I’m pretty sure this would work. The front rider drives the front wheel, the rear rider drives the rear wheel, for Dual-Drive tandem traction. I made this wire sculpture to show how it would work, and mounted it in a weathered wooden box. The nail axles are what hold the sculpture inside the box.
For sale on Etsy. This picture was used as an editorial illustration in Bicycle Times magazine. I have lots of drawings of this bike setup, with different tubing configurations. I think I could make one out of a couple of old three-speeds.
I have a series of sculptures mounted in weathered wooden boxes that I call “Workboxes.” They’re mostly metal items mounted inside boxes I found in my dad’s orchard.