Might explain why he's susceptible to blood bending in LOK.<br/><br/>I think the rest of it sounds good.  It's really up to Apygoos if he wants Aang to have a love interest who died in the storm in the past.  I'm also not sure why the Southern Water Tribe would reunite with the Northern Water Tribe after only a few generations.  It was Katarra's grandmother, after all, who was a part of forming the Southern Water Tribe.  She's still alive in the series opener, so I'm not sure that the reasons for the split would've been so easily set aside even with Osai's war.  The Northern Water Tribe's perspective on women isn't something that would've changed without Katarra and Aang's influence, nor would the Northern Water Tribe have decided to help the Southern Water Tribe rebuild if Katarra had never gone.  I'm also unsure if the Southern Water Tribe existed 100 years ago.  Though with this being an alternate universe we can simply say "yes it did" and be done with it.