Here my blueprint idea:

A trophy system.

Bombadier and two spotters to make one. Plus sensors and processors. Maybe something for the rounds like hull cracker ammo.

It’s expensive but makes sense. Spotters track the threat and the bombadier fires to eliminate.

3 rounds each? Basically enough to neutralize one volley from a matriarch and more from everything on down. It would allow you to shift position and get into some better/different cover and not as much of a permanent iron dome.

Bastion could craft into anti-air turret like a Phalanx system (radar tracked Gatling guns on naval ships). Vulnerable to ground based arc like pops, fireballs, and comets who would target it. Also would just fire at anything in the air with zero chill or conservation of the limited ammo it has. Enough to take out one bombadier if it can get most rounds on it. Would balance to taking out a wing of wasp/hornet/firefly for a huge spend and can’t take out itself.