Mechanical translational drift spinner from cardboard, paperclips and straws

I had thought about shoving a 2 wheel drive version of Dale Heatherington's light seeking spinner together with the south pointing chariot mechanism.
It would use some sort of encoder on the pointer which would have some sort of optical sensor hooked up to the mosfets which stall the motor at the correct point. I would like to do it without stalling motors but that would require me to look at it properly.

I've also designed a full body drum spinner that might work where ~80% of its mass is in its drum and the rest is in the wheels and a free rotating rear wedge that should make it work.

Edit: If you can make the the system turn off and switch to normal drive then you can run it as a non spinner.