Like I said, the Knights are not that big a problem, worst case scenario I'll just swap the Warden for another Paladin, remove the Icarus autocannons and hope that my opponent doesn't bring flyers, because my only other ack-ack option is a Thunderbolt, which while durable and shooty, is quite a sink in points at 200+ pts.
As for bringing more troops, I don't have those!

I thought about getting another lasrifle section or two, but my go-to supplier hasn't updated in months now, so I'm a bit hesitant to get more troops from her at this point. Plus, it's $50 per ten models.