Freddy
I am a bit confused, don’t you send midi during playback using timecodes? Having a button would be obsolete, since you can do this by automation.
I send MIDI from ST3 to a Voicelive 3 Extreme, BeatBuddy, and several other MIDI pedals, regardless of whether at beginning of song or at a specific time, without ever having to step on a button or a pedal.