There is another option, add in different dice in an advanced set, I've mentioned this before - in the episode VII TIE thread, similar to armada, but certain ships might have a orange attack die as well as the red, or a blue agility in addition to the green. The difference could be a side of the die that has two hits/evade results, less blank sides, but may lack the focus result or fewer of them (or more).
This x-wing advanced back could be a stand alone expansion letting you play the newer ships, but have materials such as upgrades along the lines of engine and weapons red its that replace green/red dice on other ships. This can represent newer and more advanced technology working alongside the older original game craft.