Indeed, it could work
but to be worth doing you would need to make the campign dynamic and with lots of different routes and endings, say you could choose to not help the resitance for some reason and join the east.
but some of these ideas are quite vague, for it to be workable you need to establish all the key plot parts, ie exactly how and why you are betrayed, in detail then you can work a campign around it.
--edit--
just re-read your post, a mission you mean???
it would be better to make a small campign or set of missions, it would be difficult but not impossible to make one mission out of it
but it would work better with a set of missions