How about a module (or weapon) that serves as a point defense gun? If it’s a weapon, make it take a medium or heavy point. It automatically targets and fires on incoming missiles (zenits, thermites, etc.). More effective the further away the missile is (needs time to target and fire). Less effective against aphids unless the are at max or near max range. Useless against direct fire rockets (get an ancille)

How about a Phalanx module- something that targets inbound missiles and rockets and reduces damage? Useless against rockets at close range (not enough time to target/fire) medium against medium range stuff or noricum, great against zenits. Make it run out of oomph like an ancille and take time to recharge/reload.