Not all Bretonian ships are heavy and slow, really that's only the Gunboat and VHF. The Hussar is a quite good LF, and the Dunkirk Battleship is one of the smallest, lightest battleships available. Especially since the tail on that Harrier model is taken from the Hussar, I don't see any reason to make it slower and tougher than a regular Eagle.
Really, do the stats for any of them really need to be different than the regular Eagle? You know it'll end up with some considered inferior to the Eagle and therefor under-used.