RD2000 Remote Keyboard Switch Setting?

[wurlykins]

I would like to send sustain CCs from a MIDI controller to an RD-2000 in a way that ignores the controller's MIDI channel and sends to whatever zone/channel is active on the RD-2000. This way, you can manually switch zones on and off from the face of the RD and not be reliant on whatever channels the controller is programmed to send on. The "Remote Keyboard Switch" setting accomplishes this on the new Fantoms. Does anyone know of a similar setting on the RD-2000 or another way of achieving the same result?