OK, I've come up with what I think will work for dropping lights into the alcove behind the talent for the seated mediums and closeups.
(In the images below, please note that the goal post simply simulates the wall-spreaders/pipe-stretchers that I'll put up high in the alcove)
I used 3 pieces of speedrail and 4 cheeseboros to create a U-shaped structure hanging down behind the talent. The bottom of the U can hold whatever lights I need. Again, all my lights are LEDs so I'm not talking about much weight.
So what do you think of this approach? Safety? Efficiency?