For anyone that flashed the 1M DME ZB but wants to keep the stock DSC for ACC, I wrote an Arduino sketch that toggles "Mdrive" on and off using the steering wheel switch.
As an added bonus, if you keep holding the switch, you can toggle DTC on and off.
The device is a simple MCP2515 shield with a TJA1050 or MCP2551 transceiver mounted on the PT-CAN. I will add pictures and diagrams to the repo once I have a more "production" unit ready. I'm making it small enough that it is completely contained in the LDM housing.
Enjoy!
GitHub