Hey Tom
I think I found what I was looking for my photo bucket is full so I need to upgrade but I'll post a pic soon. What I'm trying to figure out is a way to use a coaster brake hub on a sidecar and put a foot lever right by right pedal on side car frame.
I can see that by using a bike chain fixed to the pedal swing arm. Shouldn't be too difficult to design.
I recall one member was working on using a coaster hub on the front with a cable operated pull to spin the sprocket backwards. I think his biggest problem was obtaining enough leverage. The length of your pedal arm would determine your leverage but I'd guess you'd have plenty if the arm was long enough.
Keep us informed. It sounds like an interesting project.
Tom
My first Bike was Briggs powered. I used a length of chain, door closer spring, and pedal.
The chain went around the sprocket, the spring was connected to the chain the top half, pedal connected to the lower half of the chain.