Since I use the Rega method of play, by not turning off the motor, clamping would be more difficult than quickly lifting the weight at the end of a record. I have become very adept at lifting a record off of the spinning platter.

I do not know if a clamp would transmit vibrations to the record surface on a belt driven table as much as with a direct drive table. The clamp would attach to the motor shaft and any vibrations in the motor would certainly vibrate the clamp.