The aggression-free orca can just bail into highsec as well.

I've run into this stunt a couple of times recently. In fact, the only lowsec fights I've had in the past two months have resulted in orca scoops and people running for highsec. I just laugh at the risk-averse "tough guys" and go on about my business.

Yeah its a BS tactic, but hey nothing you can do about it except whine to CCP (which usually works quite well looking at previous nerfs). The other option is just to avoid amamake...

have been running into pirats doing this laterly and tho luckly they always seems to have too many ships to trow into the orcas. last time they had 7 or 8 t3s and only 2 orcas. obvious solution is to point everything and then hotdrop everything, either with titan bridge or supercaps to kill any stragglers off before it can deagress and jump out :P killing 1-2 t3s tops(the unlucky few that doesnt get room)
tho thats pretty much the bruteforce way of doing it, and pretty annoying.

besides that you gotto bait them off orcas, seen vindicators mwd bumping the orca off the gate thus forcing it to jump before it got out of gate jump range, also pretty annoying and most t3s will simply start deagressing when you do that.

you cant really treathen the orcas to jump out too ealie unless you use titan bridge and jump in 50 drakes or something, since fighterbombers wont hit it well. nor does fighters do enough alpha to volly it.

last option which only work in some scenarios is baiting the t3 off the gates, but normally they are really really risk adverse and refuses to move off the orca.

obvious solution to this is to increase the orca sig radious so we can 1 volly it with supercaps fighterbombers.