OK tis is a good topic. The motorcycle hydro clutch is good but it is turned the wrong way. A cable system would be easier but I think that gaining the leverage over the clutch would be tough. The solenoid might be the ticket, except that it is not variable. You could look for an eletric actuator but speed might be a problem. I guess with all the choices I would go with a mechincal motorcycle lever on the shifter. I have seen shifter mounted throttles on a few off road rigs, makes it easier to stand on the brakes and clutch while you crawl over the rocks. Most of us don't have that whole heel toe driving trick down pat just yet.