The Hegemon fits that role. That ship is beastly when it comes to combat. And miners aren't about combat. If they want defense, then they have to have escorts.
They put guns on trains during WW2, but those trains couldn't take on an army. Same rule applies here. Economic and Industrial equipment is not meant for combat.
"THE HULL HAS BEEN BREACHED AND THESCIENCEIS LEAKING OUT!"