I tried that with my fermentation kiln, a couple years ago. I could keep the temp low enough for a good cure, but I had too much trouble with the humidity. My kiln then did not have a fan, nor adequate control on ventilation, and leaf remained too wet, too long. If it didn't mold, then it turned brown/black from composting. You'll need high humidity (90%) but not wet wet leaf.
Am building a new kiln now, and may try it again. But, then, now I have access to another large chest freezer, so I may just build a new flue-curing box with this.