Q-ship
Interesting. Started in WWI with the intent to lure U-boats into making surface attacks.
Their codename referred to the vessels' home port, Queenstown, in Ireland[1]. These would be known to the Germans as a U-Boot-Falle ("U-boat trap"). The Q-ship would pose as an easy target for the U-boat but in fact carry hidden armament. A typical Q-ship would be an old-looking tramp steamer calmly sailing alone near an area where a U-boat was reported to be operating. By posing as a suitable target for the use of the U-boat's deck gun, the Q-ship would encourage the U-boat captain to bring his vessel to the surface rather than use one of his expensive torpedoes, which were in short supply. The cargoes of the Q-ships would be wooden caskets and wood (e.g., balsa or cork) so even if torpedoed they would stay afloat, encouraging the U-boat to surface and use its gun. If necessary the crew could even stage an "abandon ship" routine. Once the U boat was in a suitable position the Q-ship would change rapidly, false panels would drop to reveal the hidden guns which would start firing. At the same time the White Ensign (Royal Navy flag) would be raised. With the element of surprise the U-boat could be quickly overwhelmed.
That's definitely what we should be doing against these pirates. And blasting them to Kingdom Come as part of the last-minute surprise.