Looks like a good solution. As a guitar player i have to use a big whole house humidifier and check it with a hygrometer because I like leaving them out of their cases. Lots of "in the case" humidifiers at any guitar store too; they're either some kind of fancy sponge or a little button filled with a kind of moisture absorbing clay. Cheapest is just a well wrung out, but still damp, kitchen sponge. The tobacco ones you cite sure are high tech though.
EBONY CHESS PIECES-HUMIDITY CONTROL-WORKS GREAT-NO MORE CRACKING
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Some of us in states where the humidity levels are very low have experienced ebony pieces that have cracked. I have no affiliation with this company, but I purchased these and I put them in my chess storage box of my set and so far work like a charm-Thought I'd pass this on to you other folks who live in low humidity areas like I do in Nevada.....link here:
http://www.bovedainc.com/store/tobacco/boveda-medium-8-gram/