Hi guys....I'm working from memory here, BUT I kind of recall it was during the 1st World War that when the Allies tired of taking such a beating from German sub packs, they outfitted some innocent looking merchant vessels with serious deck guns hidden behind false walls. When the German subs surfaced to demand that they abandon ship prior to being sunk by their deck gun, the side walls (being hinged) were flopped down and they opened up with their deck guns, sinking several subs in the process.
As I recall, these converted merchant ships were called "Q" ships.
Now I ask you, how hard would it be to outfit a a couple of these ships to bait the pirates into attacking them? Fighting unconventional forces requires unconventional tactics....
Those that live by the sword....