The Neg'var at least could occassionaly use the alternate skin, and the Typhoon could maybe use the Galaxy Dreadnought or something like that.

I can't say I am a fan of the Typhoon in the first place, but I am not sure I should admit that considering the calls for it becoming a playable ship...

With the Romulans I can understand the limitation - they just don't have more ship skins now. (They should get onto that, if they want them to become a playable faction one day.)