The air conditioning in my S10 and Saturn blows damn cold air...Since cooling the heads on a type1 is critical why can't an air conditioning unit be configured to nozzle cold air into the back of the fan shroud to be distributed to the heads?
Mechanical cooling (A/C) is not magic. It is removing heat from a place where it is not wanted, and rejecting it in a place where it is not objectionable. The process involved is actually quite complex. It's propensity to break has kept me gainfully employed and monetarily comfortable for 30+ years.
The short answer is: liquid is a much, much better way to accomplish head-cooling that what you are proposing. Water cooling involves only two heat transfers: from the head into the water, and from the water into the air. Nothing needs to change states, pressures, etc. No compressor is involved, no secondary cooling medium. All that is required is a pump and a radiator.
That being said, an air-cooled engine is even more simple than that: only one transfer, from the head into the air. If you want something tricky and cool, work on the oiling system to spray more oil into the rocker-boxes, and put a bohonkin' oil cooler on it.