For my testing, I've given the bomber to the Tech hangar. I've edited the squad, string, manifest and entity files plus the ability and buff. I've added several new strikecraft (two for each faction) but only the Tech Heavy Bomber is added and the tech hangars and cap carrier are equipped with it. Only the hangar has the ability and buff for linked craft.
The hangar construction queue shows the correct name for the new type and it can be built and launched. When you mouseover the squadron it shows the correct name and info but when you zoom in to the individual craft, it says "Bomber"--as in the generic one.
Here's the link to the mod (its 158kb for vanilla Diplomacy): FIGHTER-BOMBER
If someone wants to test it--only Tech has the new craft and just the one is modified--the Tech Heavy Bomber.