Stealthy drying method? Any method to dry closed i...

As long as you control temp and RH, it'll dry appropriately -- also no direct and constant wind breezing over it should be avoided. So, as long as it's not too small that it causes windy conditions, sure. In fact, it'll help if you need to be covert -- use active carbon filters, create a little negative pressure, and you can virtually eliminate the smell. Temp, RH and darkness. Light actually degrades the various relevant compounds faster than common sense temperature ranges in the world -- or at least most of the world. I don't know the exact point heat becomes a more relevant factor. Some sun-blasted region with 120F days might tip the scales?