I read this in a book and decided to give it a try the last time I cooked chicken on my WSM, it worked pretty good.
Take a propane blowtorch, the kind you use to sweat pipes, and use the flame to crisp the skin. I get the torch head an inch or two from the skin, so the side jets are touching it, and move around to keep from burning. It works pretty good and it's fast.
The results are not exactly the same as high heat cooking, but they are acceptable enough that I can serve the chicken with the skin on.
I keep the torch near my BBQ equipment because I also use it to start my chimney, but that's another thread.