I still don't like the idea of a dehumidifier, but that’s just me. As far as mold goes a good prevention method is having a good air flow through the leaves. A fan blowing gently will stir the air and venting will help to remove the humidity. You'll still have to keep an eye on them for mold, but I think that you'll end up with a better product. However in saying this long speech I've never used a dehumidifier, don't even own one. I'd suggest trying it out on a small batch first so that you don't end up ruining the whole crop.
Good luck with it, I'll watch with interest.
Oldfella
ps: a 1% solution of Hydrogen Peroxide sprayed or brushed on the mold areas kills without affecting the flavor.