I think what you have here is a great idea, only one thing I would add is to pay attention to the major houses that Arty...Tabris, mentioned above. If you have an interest in creating your own family of highborn status, I would give it a little push by making the mother or grandmother a member of the high houses. I will let Tabris, come up with more sound RP ideas if the above is no good, he is into Elezen lore and politics to a greater extent than I, but as I said, everything else sounds absolutely wonderful and maybe for that extra little boost I would find a group that you could possibly work yourself into to allow some more chances for that dark underbelly to your character really come through!
Good luck!
Good luck!