You mentioned Council using Junker shipyards in the OP.
Problem.
There is exactly one Junker "shipyard". And it's in Puerto Rico. Which is a guard system. In Liberty.
Now isn't that a bit far for a Council Warship to wander?
The only shipyards in the Taus are also in guard systems, and while I can see the CR or IMG letting Council use theirs, I can't see that for any other unlawful types.
Valetta's not an option except for Brigands/UC who want to get murderized by literally everyone. (That's not an exaggeration. Consorting with Outcasts is more likely to get you killed in horrible ways than playing along with the Loyalists is.)
And there's no base with "shipyard" in its name in Gallia proper.
So, while Council might be able to rub off with the IMG or CR (which is perfectly fitting), nobody else in Gallia can. I'm not suggesting the building of shipyards in the Gallic Borderworlds- however, Dijon Station and Chalons-en-Champagne function as full scale supply and repair stations, as well as selling Gallic capital ships. They don't actually build the things, but they maintain them just like a shipyard would.
Could you please add them to the list? I was kind of hoping to make the Temeraire stand out a bit. Or to get the Maquis to use lights that distinguished them from Council.