Alright, seriously...
I have a few ideas, but I would like someone with good experience on making campaigns to actually execute this if they'd like to.
It's a rather simple storyline, it's about the people left behind in Sol ever since the jump node collapsed. However, nothing really is going on, but the story focuses on a rather old man, who was once a pilot during the Great War. He tells a handful of pilots, or just one, his story and his experiences. The player will then live through those experiences.
However, the style this will be done is jumps, jumping between the past (the man's memories) and the present.
The old man however, flew with his best friend Petrarch during the Great War, however, they were separated, and the old man was stranded on earth with some other people.
The years have then passed by, and the old man is retelling his ordeal, and how he one day wishes to see his good friend again (who is now, an admiral), and how he promises himself to not die until he sees that Petrarch has returned.
So yes, you can do whatever you want, it's just the Great War, except with character development garbage.