I googled around and found this bit of a discussion on the Provo Rig. It was about how to make quick-change tags. I'm finna try it on Mon or Wed (depending on weather) when I go with my buddy Jay. Seems like those kind of quick running pools on Upper Spillway (Cardiac Hill?) would be a good place to try first time. From what I understand you want a fairly buoyant indy, like a balloon for ex., and you're looking for not subtle motion but more like full stop, or like crappie fishing with minnows. I might try just a small, old fashioned bobber.
Here's the tip I found for quick-change tags:
Taper the main leader to 10 or 8 lb Maxima leader and tie bloodknots where you want the droppers to be (trim off all tags). Then cut pieces of 6 lb Maxima or 3x tippet at around 6 inches. Tie perfection loops on the end, then you can pull the fly end through the loop around the main leader and cinch it down against the main leader, above one of the bloodknots. Slide it down so it rests right on the knot. You can easily loosen it using the point of a hook and swap droppers all day. If one of the flies snags you should only lose the dropper and the rest of the rig stays intact. Hope that makes sense.