[quote=@Genkai]
Canon doesn't need to be set in stone but sounds like doing so might be easier/preferred to you, which is fine in my book. I think our easier route would be to play Grey Wardens who did survive but I do think recruiting our own civilian folk would be fun, as you said. You mentioned playing grunts which I think may me wondered about the ones who got to run off when the PC let them go as opposed to killing them. A number of different people could join the cause and it's entirely likely we could follow the Party's movements but always be a few steps behind so we can see the aftermath of main events. It would also give us room to do our own thing, pick up our own side quests of sorts and do our own to clear the Grey Warden name, so to speak. 
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So if we go with surviving Grey Wardens idea we could simply say that our chars also think that they're the only two surviving Grey Wardens (say they simply turned and run once things became hopeless). And as the only two surviving Wardens they would either keep running with the intent of escaping Ferelden once they realize Loghain is after them (Essentially deciding to leave Ferelden to die and wait to fight the Blight after it consumes the nation.) or they decide to stay and fight the Blight to the best of their abilities, unfortunately the ancient treaties have been taken by Morrigan and Flemeth so our chars would be forced to start from the zero.  

If we go with the grunt idea most of our storyline would deal with the conflict between Loghain and the Ferelden Bannorn in the civil war. Which would give us the chance to explore the background of the setting but it wouldn't be as action packed as the other idea. But since you prefer something closer to the main plot the surviving Grey Warden idea sounds better.