Most teachers don't make enough money, but they have at least some time available in the summer. Why not start a program similar to the Federal Flight Deck Officers (but locally controlled), where teachers can take a few weeks training during the summer? They'd be taught the law, how to shoot, and how to care for a pistol. They'd be taught some level of action shooting, beyond what it takes to get a CHL. Then they could deputized. But in school they'd carry concealed. Most people wouldn't know who they were. To provide an incentive to do this, they'd be paid a bonus, perhaps 5% more than their base salary. To encourage regular practice, the school might want to provide them with a certain amount of free ammo each month.
Besides the obvious improvement in security, there might eventually be some improvement in the prevailing attitude of teachers about firearms. This might end up being conveyed to their students, which would improve the attitude of society as a whole.
Even the Amish could participate, if they could get past their pacificism. They could be issued cap and ball revolvers.
