Some good stuff here, Central. But I think the money issue is valid. I work in a Kansas school district and I had to pull teeth in order to get 30 new copies of a novel I teach (whereas I used to order them 100 at a time). Schools don't have the money they used to. I'd be surprised if school districts would go for something like this (at least not right now). They'd have to buy the units and have them installed (more money).
We got new scoreboards a couple years ago, but that was only because a bank paid for them (and put its name on them). No room for sponsor names to go on shot clocks.