I haven't seen anything about buds, but the tech used in this link sounds reasonable:
http://cannabis.com/faqs/growing/curing-how-do-i-re-moisten-dry-buds.html
(Maybe you've seen it already though.)
Due to the impossibility of finding dope around here we use every scrap we grow for hash etc. so I do a lot of cryo-extracting from fresh leaves, but I've never used the heat press tech.
When I do cryo-ex it is to keep everything that is water soluble frozen. I mainly use 99.5% Ethanol that is well below 0 Celsius (NOT De-Natured, and NOT Methanol!!! Although you need Methanol for making shroom crystals hehe) to do a simple solvent wash, basically it is a "QUIETH" I guess.
But sometimes when I have plenty I bring hash into the lab and refine it more and get kind of a low-grade shatter.
If moisture is the only problem, than a freeze dry should fix it, but if not can you heat press using cooking paper?
Since it is non absorptive you could collect the rosin/water together and do a vac-dry maybe?