This is such a great idea. Before I was just chopping the hay until it was almost powder and sprinkling it over his mazuri. Don't know why I didn't think of this sooner, lol.
I feel your pain. when I got my baby sulcata, the pet store sold me all the wrong products and gave me basically the same info as you. "No water. not even a water dish because the humidity could kill him. They get all their water through their food." This particular store has an 11 year old...
plain white vinegar always works for mine. Cheap and easy to find. Also deodorizes and is safe for use around animals. I use it to clean all of my pets cages. Love the stuff. :D
Maybe you could make one large enclosure with separate compartments for each animal? Or even just a divider in case the cohabitation becomes a problem?
It's funny that you call it the "dead tortoise pose" lol. the first week I had my little guy, I noticed him doing this and totally freaked out. "OMG what did I do? Is he dead? Is he sick?! What happened?!" Now that I'm used to it I think it's adorable when he sleeps in silly/awkward positions.