Glass tile requires modified thinset, Kerdi requires unmodified. If I had to choose between the two, I'd use the modified thinset over Kerdi and allow an extra day or two of dry time.
Schluter recommends unmodified over Kerdi because of the dry time, but since this is a small tile and will allow for faster drying time vs. a larger tile, you shouldn't have a problem, especially if you give it couple of extra days. I've done it myself several times and never had a problem.
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