GRJ, is the Hennings lighting board available a la carte? I can't tell from the web-site.
That is, I agree that a handful of low-cost components can do the job but like the 12V LED strip wiring there are lots of guys that don't want to fuss with soldering, wiring, sourcing components, etc.
So. If you replace the 12V DC LED strip with a 12V DC relay (plus a diode across the coil), couldn't that lighting board (IIRC 45mA output?) implement this?