Not gonna lie, at one point I had a massive fanfic planned where the Hawkes were quadruplets just so each of the four DA2 LIs could have a boyfriend/girlfriend. Needless to say it did not get written, like 99% of my fanfic ideas 
Yeah, I totally feel you on that. I have hundreds of half-written vignettes and ficlets and timelines and cue cards and spreadsheets that will never see the light of day elaborating on the vortex of wild headcanons that make up my official canon. 
I am a heavy subscriber of the four Hawkes headcanon, though, both because I love that cast too much and because it helps the DA2 story flow better to me in a lot of ways. I can't stand to let either of the baby birds die so Bethany and Carver are both very much alive, I can't stand to leave either Sebastian or Fenris alone so both fHawke and mHawke must live... and even discarding my playing favorites like that, I also think that deconstructing the Tale of the Champion as the stories of four different people all mashed up into one makes Hawke's life make a lot more sense to me. You do and say so many contradicting things as Hawke, and some parts of the story are so wildly glossed over that sometimes I just give up and like thinking that a lot of those "what is going on here??" moments in the game was just Varric mashing the lives of four very different siblings under only one's name to preserve the others as best he could, hide the fact that they're all alive and doing different things out there, and some of them really don't want to be found. So, say, fHawke got all the attribution because the fact that the Viscount of Kirkwall is alive and married to the Prince of Starkhaven is kind of impossible to hide from the masses, but at the same time almost no one who wasn't there and saw it for themselves knows that mHawke exists too and is out there with Fenris, hiding from the mage war, because he "died" early on in the story to preserve their privacy. Stuff like that.
I did mention a vortex of wild headcanons, didn't I. 