re your quickknob mapping:  If your controller does not allow you to bias the button min/max on a preset basis, your exp pedal idea (or knob on the controller?) might be your only path(s) to victory.

re your hotswitch mapping:  Changing your source controller’s button behavior from “latching/toggle” to “momentary” should do the trick.  But here again, if you can’t adjust your controller’s button behaviors on a preset basis…