These are all nice suggestions that I'm really appreciating. I'm really not sure what this is gonna come to, but when it does, I'll make sure and take some pictures.
In general, I'm thinking that it needs to be fairly simple, lightweight and inexpensive. I had visualized some sort of portable contraption...call it a jib or jig...that hangs over the side of the balcony, maybe similar to how a portable ladders hangs off the side of a boat.
So on the top side there would be hooks of some sort that reach around and latches to the top half wall. Then on the bottom side there would be some kind of a table or fixture onto which people could clamp their mic setup...basically the mics would need to have their own clamp/kwon-ish setup and those would clamp onto the fixture somehow.
It would need to be lightweight because we'd have to pull the whole thing up before and after the show for mounting the hardware onto. Yet it would need to be sturdy enough to hold a bunch of mics, because Pittsburgh is a pretty big city and Team Pittsburgh has a pretty hearty taping crowd.
My thoughts anyway...seems like there's gotta be something like this out there somewhere that can this be patterned after.