Here are two observations:
If you've ever used the OLPC crank charger, you'll know that while it works as advertised, it takes a lot of cranking. The charger would work better if it could be attached to a wheel. Then, you could rotate it by fitting it on to a bicycle, a sewing machine, etc. To that end, I took apart the handle and saw that one could easily fit a small wheel on to the shaft.