Sorry to dredge this up after so long has passed, but your suggestion intrigued me and I can't find any information on it, so I figured I'd go to the source...
I am a Prop 215 patient and do ice water extractions as frequently as I have time. I was working with some fresh frozen material a couple weeks ago and, while the results were absolutely amazing in every respect (taste, melt, effect, etc.) a lot of the product came out in such a sticky, putty-like state that all my normal methods for increasing the surface-to-air ratio to ensure even and effective air-drying proved ineffective. Once air dried, the product still turns to insanely sticky goo after a few seconds of body heat contact. As a result, my sturdiest efforts to pass it through a sieve, a micro plane, even to cut it into small pieces with a knife were unsuccessful. I even went so far as to freeze it, freeze my microplane, and then try to plane it in the freezer. But even the heat from my gloved hand in a cold environment was too much to maintain a workable composition.
So I'm sitting with my patty on ice trying to figure out how the hell to process it without it molding up on me. Then I find your post at the end of this informative thread and go on to look up information on the process of sublimation, which, as I have come to understand it, is the active process in freeze-drying where bringing the material's temperature way down and then decreasing pressure using a vacuum pump causes the frozen water particles to instantly vaporize and be removed from the material.
This seems like a brilliant idea for drying ice water extractions! Compared to air-drying, even in a humidity-controlled environment, it seems like you get a much more complete, consistent drying effect while also maintaining extreme cold to preserve all the volatile terpenes. Surprisingly enough though, I can't really find any information outside of your post that would suggest anyone has actually tried such a method. Do you have experience doing this? If so, how have you found the process and what equipment did you use? Any extra information would be very helpful, as I'm finding basically nothing!