If you have several players that want to see him eliminated, see if you can get together more martyr-nav combos than he can hire pirates.
Alternatively, if you have outposts all around him, you could outmaneuver his pirate with a martyr-nav-smuggler combo.
Aside from that, eliminating him with brute force will probably take several thousand drillers.
“All warfare is based on deception. Hence, when we are able to attack, we must seem unable; when using our forces, we must appear inactive; when we are near, we must make the enemy believe we are far away.”
― Sun Tzu, The Art of War