Update, we had a snafu with the supply of the previous connectors, and they were a royal pain in the behind besides (lots of shorting out in the field).
So to make things simple, and get the units out the door, we went with an rj11 (phone) plug on a 5 foot lead (the retaining clip is up in this picture).
You can get an inexpensive box, which can certainly house some additional circuitry if needed, or you can dyke the plug off and split and splice as desired.
