Here's the plan, such as it is:
Step 1: make a stand for the bike
Step 2: attach the motor to the stand so it spins off the rear tire somehow
Step 3: pedal like crazy, and hook the motor wires to the battery when the RPM/voltage is high enough to feed juice to the battery (rather than have the battery spin the motor). Generate lots of "free" power.
Step 4: Reap the fruits of better living through physics and chemistry! Or something.
Today I did step 1, and ended up with this:
Ghetto bike stand made out of scrap wood!
I was going to use a discarded shipping pallet for the wood, but found some other scraps, so I didn't have to spend time disassembling a pallet. Yay.
I've already test ridden it. Functional & stable! Next time, I'll post how I put it together. Though it's obviously tailored for this specific bike, you could probably adapt the approach for any bike.