[trikkonceptz]

Having the same car I too have put thought into the same idea. Here is what I have been contemplating;

-A dry Ice cooler, attached to the a/c recirc intake inside the car under the dash. This cooler would have an ambient temperature fan to keep it cool as long as possible, but it would draw the cooled air through the vent thus providing a/c for as long as the dry ice lasts. You would have to test to see how long that is, but it may work.

Second option;

Remove the compressor from the belt system, research the smallest compressor possible, like the motorcycle ones used on goldwings, etc and drive it with an electric motor. The draw from that could be offset with solar panels or a second battery off the system that you could charge nightly.

Try that see what sticks ..