Wow, thats insane that it is so hard to find everything. I have never just used peat moss, but I don't see why you couldn't. I mix my peat with the dirt and sand. The texture is very much like eco earth. So it is very fine so you may want to pat it down, it will be a bit dusty at first as well, so you may want to give it a good spray down mix it up spray again until everything settles then let it dry a bit and see what you think. The other option you have is if you can get hold of anything like Provent A Mite or a like product, you can literally dig up dirt from a yard provided it doesnt get sprayed with pesticides and treat the dirt if you are worried about mites.