you're welcome
one footswitch would require some co-ordination of hand and foot. With two footswitches, one could be used to stop the rhythm when you lift the left hand, which is relatively easy to achieve cleanly. The other could be set to a panel memory with synchro start enabled, then this panel memory could be enabled just before the left hand chord with the start of rhythm playback again, that requires little co-ordination for a clean rhythm start.