Oddly enough, a similar discussion came up with the issue of concealed carry on campus. The idea was that students and faculty who cc’d could voluntarily join an emergency text messaging service, so that if there was a campus event, they could take up discreet concealed and covered positions near the entrance of their building, while everyone else remained in their classrooms.
Lot of bugs in the idea, but it did raise the concept of tactical building security against an unspecified threat.
That’s inspired - if they could work out the specifics of such a plan, committed people to carry it out, and a way to stop the inevitable blowback from the Left...