If this is designed correctly then the shock absorber is built into the rear of the clutch where it interfaces to the large gear. This is the same idea which is used on some Japanese bikes where there are springs, the same idea as in a car clutch, where one set of springs takes up the forces in the drive direction and the other in the over run direction. This, in conjunction with a Bendix or pre-engaged starter motor in the original dynamo position, would be my direction of travel if I could get round to it.