Robert,
Have you tried using the foot pedal assignment "Style Start/Stop"?

Depending on what other parameters you may want to change such as voice, ending, etc., you can either (A) hit the foot pedal again to start on the downbeat or (B) set up your preferences in a 2nd registration button that will instantly activate your new preferences on the downbeat.

Just be sure the sync/start button is activated in your 2nd registration.
Eddie