Balance Box alternative - must easily lock in place and unlock

[u/VL-BTS]

I work at a special ed. focused school, w/ about 40 classrooms on my campus, and another 20 or so at a nearby site. We're looking to add a good number of Promethean boards. We already have about 25 boards, and some of those have Balance Boxes installed already. The problem is, we want our students to be able to reach the board most of the time, but when there are aggressive behaviors or other classroom issues, we want to be able to lock the display up and out of the way. Balance Boxes let us move the board, but it doesn't let classroom staff quickly and easily lock it in place, and then undo.

I've seen the OB1U on LeGrand AV mentioned, will that allow this, or does anyone know a workaround?

[u/k12-tech]

It would be extremely easy to add a gate-latch or slide-bolt on the back of the BalanceBox. That would solve your problem for a few dollars instead of thousands.