You wouldn't need a dual sprocket clutch. Just put a fixed gear on the crank, then put your centrifugal clutch on the jackshaft. Now the chain is alway's moving and you could put the generators gear right onto that chain. And like normal, when a certain rpm is reached, your jackshaft would start turning. With the chain moving constantly, you would definetly want a chain gaurd for the little ones. How much was that light kit btw? Oh, the next time your concerned about turning a shaft backwards and worry about the nut coming lose, you can simply drill and cotter pin that puppy in place.