Fermentation shouldn't need sunlight. I would try it in a small cooler with a stone on top of the leaves pushing them down. If your set on doing the bag, grab a packet or two of silica gel out of a package or two of beef jerky. It will help keep the moisture down when the leaves heat up. Plus you get to eat a couple of packs of beef jerky.
Edit: and by small cooler I mean just big enough to close with the tobacco and stone in it.
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