I bought a flirt pole toy to use with my high prey-drive lab, Sassy. It was actually recommended by a behaviorist and worked amazingly well. At the rescue I work at, a guy was doing a demo of a much nicer version. I'll try to find a link to it. It's a great way to tire out a dog when you have limited space.

I think all the ideas have been really great and I want to commend you on what you're already doing. You've definitely put a lot of thought and effort into working with your pup. :)