Set one of the buttons to a CC you are not using $button 52 ;bottom right .easypar CC 01 127 0 1 toggleon .showvalue on .default 0 Now send 0 and 1 to the BC with CC channel 1 127 and the LED will go off and on.
If you are not using all the groups in the top row you could set .egroups 2 and use button 59 or 60