Why couldn't you put the beads and a glass of water in a small closed container and just let the beads absorb the water through the air, then there shouldn't be any contamination. If you can warm the container up by placing it near a heat vent or in a warm place like the kitchen, the air should then be able to hold more moisture and the beads will try to absorb it. At least that make sense from my way of thinking, but I don't see 60% RH as bad for the short term.
