Don't see why you can't use the PPCs on the FRONT turret to do the job.
That's good for one but not that good for a swarm of those, especially if there are Carriers as well. Also, the Panther cannot mount PPCs anywhere

Of course, one Destroyer can be handled in a Panther. I am thinking more of a Khaak sector visit. In X3:R it was fun to do it in a Raptor.
It looks like I might need to get myself a destroyer or a carrier other than Tokyo which also has no long-range weapons on back. I wonder where can I capture that fast one from Yaki...
I don't really know what you would do with a Km2 now if you could capture one - they just aren't the scary monsters they used to be.
IMO, they are still the same scary monsters. At least it is one of the few ships that is not easy to take out in a Springblossom (another one is the Carrier). True, Xenons got a bit stronger. But it is mostly due to the fact that their fighters got PBEs and how J now spawns those fighters. In a Titan (or any M1/2 for that matter) you can kill pretty much everything and it was true in X3:R as well.