The water sitting on the moss doesn't warrant mold growth? That sounds like quite a musty area inside the ceramic bowl, but the idea seems solid, I've been thinking about using a humid hide but this sounds like a good way to get the humidity up for him without making HIM work for it. Definitely will be looking into it!
Also Gale, that comeback story sounds brilliant. I've decided to put Pip on a 6 day feeding schedule (hoppers) for now..I hope to see him grow as fast as your little guy did.