I just built a fleet which is trying to use Kallus on an ISD2 instead of escort fighters for my rhymerball, and while working through my shenanigans realized there's some potential for him with the new upcoming Arquitens light cruisers. They have an evade and a turbolaser stock, allowing Kallus to add a red die against unique squadrons and the ship to exhaust its evade to set it to 2 damage. So you're doing minimum 1 damage to squadrons.
But here's where it gets fun.
My ISD2 is built as the Avenger, with Quad Laser Turrets and Leading Shots. That means with Kallus it get a counter 1 + 1 die of my choice, and it can give up the 1 blue from Counter to reroll the other die if they both blank. In a normal anti-squadron salvo it throws 2 blues with a reroll on one against normal squads, and 2 blues and an extra with a reroll on a blue/extra against unique squadrons. And, none of them can use defense tokens if they're exhausted thanks to Avenger.
The Arquitiens might have even more shenanigans, depending on its upgrade slots and cards.
Here's the whole fleet, which is pretty annoying altogether:
Konstantine's Christmas Trees (398)