I was thinking if you had a set voltage and resistance you could hold a certain rpm for the motor going to the gears. Then if you needed to adjust it you could stop the current by dialing down the voltage or possibly increase the analog dial to increase the voltage and make the clocks motors all spin faster until you reached the desired time and dial it back to standard voltage. But you would have loss over distance in the wire unless you made them all the max length needed, and coiled them to make them all the “same length” from dial to clock.