I like your thinking.
Alternately . . . have a shell of a plane . . . in the desert somewhere . . . with these jerks as bound passengers with some of their own explosives wired to go off at a critical moment in the training of anit-terror forces exercises . . . but perhaps take several sequences of such to finally do the trick.
I know, cruel and unusual . . . welllll these jerks are cruel and unusual in their methods so let some country that understands the language they speak pull it off.
I hate having to fight violence with violence but that's just the breaks, folks. That's reality. They don't understand anything else.