I've seen someone do it for an apple cooler using a coolbot. I didn't know it was called a coolbot at the time. I did know it looked expensive and impressive.
I think you could do your own 'coolbot' using a STC-1000. Maybe just wire up the cool contact to something that makes a bit of heat like a few watt resistor, then tape that to the temp sensor on the a/c unit. Presto, coolbot like action for maybe 1/10 the price.
eta ... but it would not have an countericing measures for the evaporator then. I suppose one could use a second STC-1000 to monitor the temp just in front of the evaporator so if it starts icing up to cut off the heat source to the a/c temp sensor. That still wouldn't be too bad pricewise.