We've ended up having to make our own, as I haven't seen anything suitable out there. You may just want to spend half a day or so making up a basic wiring harness with power, ground, CAN, and maybe some switches and turn pots.
The outputs you can monitor easily enough on the Service Tool, so you really only need switches and maybe turn pots to simulate inputs. Even just wiring an input up to a banana plug is good, and you can plug it into the high side on your power supply to simulate a button press.