I'm no expert, but this thing is starting to look a bit like a heatpipe. If that's the direction you are going, why not just have a waterblock of sorts over the processor, and a thin copper pipe (1/2-1/4") going straight up from the heatsink with a fan in it (I have no idea where you would find one that would work in these conditions), curving down, and going through a large spiral of tubing to cool if off. You could fill it with alcohol or a similar evaporative liquid and put a fan or two in the spiral to cool it. As the alcohol hits the waterblock, it wil vaporize and carry the heat around to the copper pipe spiral, where it re-condenses and releases the heat. Of course, heat saturation, where the spiral cannot disperse the heat faster than it is created by the processor, is a problem, but this system has the definite advantage over watercooling of being entirely enclosed.
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