Suggestion, make a Dunkirk Mk2 which has less turrets, but more heavy slots, all facing forward. Heavier hull (it's not hard to slap an additional layer on it), but don't touch the powercore (that would mean a too extensive refit).
The idea is that Bretonia could recommission old mothballed hulls and turn them into mobile artilleries, good at only one thing: fighting face-to-face with a Valor. The Dunkirk refit could be made in limited numbers, to reflect the exceptional nature of that measure, and handed via admins to the official faction upon request.