I have not tried freezing.
Seems to me that if anything in the rubber dissolved into the card stock, then when it freezes it might damage the paper. But then freezing would freeze water, but not rubber cement thinner. (Which really is good stuff, stamp collectors use it to get modern adhesive stamps to release, and for detecting watermarks in the paper used for postage stamps by immersing them in the fluid in a black tray.)
I have used rubber cement solvent, most recently on a 1934 Goudey, it worked very well. But patience and small quantities are key.
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