Regarding Old Judges, I haven't ever soaked these, but since they are albumens, and I HAVED soaked albumens , they theoretically should soak okay. But I would never do it, mainly because the backing is thicker and would curl - then you've got to deal drying it, which takes exponentially more time as the thickness of the backing increases - I know this from soaking mounted albumen cabinets. In the end, you are likely to have a slightly more attractive, curled card - I would leave those to professionals if you really have to get it done.
Also, not sure if I mentioned it elsewhere, but 'National Copper Plate' premiums soak very easily. I had a disaster of one that couldn't be hurt by soaking, and I was surprised to see how easy it was.
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