No more hidey holes

We are slowly filling in all of Tex's hiding spots with boxes and blankets, leaving only shallow alcoves. I want to cringe when I think about it, but I think it's doing him some good. The negatives are: he hasn't been eating all his food since we started, and he's a bit more hissy when approached. The positives: Tex is now okay with spending time out in the open in the living room with us. Actually, he's more than okay. Once we get him onto the couch we don't have to do anything to keep him from fleeing. He rolls all around either on our laps or between us, kneading his big paws into our legs. He doesn't mind that the dog is also on the couch either! He stays for a good long time and purrs away.

Here is another big hint that he's progressing. I was slouched at the corner of the couch a few days ago and happened to glance at the arm of the couch by my head. Who was looking at me from the other side, stretched up on his tippy-toes to see over the arm? Tex of course! He retreated when I looked at him, but I was proud of his boldness all the same.

It's been suggested to us to put a harness and leash on him for about a week and hold the leash or tie it to ourselves, forcing him to be near us all the time for that week. I'm not sure. Thoughts?