Christine, I had a similar issue with my LO a few months back. He wouldn't touch food in his high chair, but he would eat while walking about. I also followed him around with food to get him to eat. The thing with him though was that I think it was just control and he wanted to do what he wanted to do. Dinner time was the worst for us and I actually had to spoon food into his mouth as he walked about our house. Fortunately, he actually sits in the high chair now.
I don't know what to suggest, since I did the same as you. I just kept trying to get him in the high chair and eventually just let him eat while moving around. I even got desperate and would turn on Sesame Street for him, which actually worked.
I think that is how I got him to eat in his chair and then I eventually weaned the TV.
As far as protein bars go, I do have a recipe for toddler protein bars, but I can't find it. Once I find it, I will type it out. I would just say get him to eat what he will eat and make sure it is all nutritious. My LO's snacks basically turned into meals that he hadn't finished. That way I knew he was getting wholesome food in him.