Add Igniter'n'things vendor to Security. Or just straight up more Securitrons.

[Firebarrage]

Robotics fabricators can churn out security drones for a material cost (rather than stun batons/helmets/etc.). Authorize QM/mining/robotics to make a bunch and I have no doubt they'd be more than happy to create your little army.

This is what I've always done. Works like a charm.