I have thinking a lot, and maybe this could be the simplest solution for single switching multi CC assign on stage.
Mr. Kemper, please give to the KPA two CC numbers for these two butons: the STOMPS on/off button and the EFFECTS on/off button and make this wonderbox to send and receive MIDI messages!!!!!!!!!
This way I can resolve almost all of my live playing - KPA controlling footswitch needs with some simple and easy programming!!!!!!