Hm. Well, the cheese method of using a phase frigate flagship to lure one large triangle away from your fleet is a pretty decent starting point. One frigate works fine for the regular two-triangle battle; for three triangles, I'd suggest having a second flagship you can swap to because you'll probably run out of PPT before it's time to bring that last enemy back to your fleet.
Which then means you need a fleet that can take on two-and-a-half of these things on their own. I'd suggest HSA disco paragons - HILs, graviton beams, tac lasers - under most circumstances that's a bad build, yes, but against super-aggressive redacted AI ships, it should work pretty well; the range malus doesn't matter much when the enemy's going to close to point blank range regardless of what you do. Two paragons does pretty well for the regular game case, so here you probably want to be able to field at least three, maybe four. If necessary, crank the battle size up so you can actually get enough of your fleet on the field.
Use orders to keep your fleet all balled up; rally civilian craft maybe, or perhaps setting each paragon to escort the next in a loop?
For bonus points, have a few high-durability (max caps, front shields, accelerated shields, hardened shields) omens that you can deploy later on to help kill fighters. Probably not needed, though.
Are there better options? Probably! But this one should be effective enough.