Beware any rule or system that ever needs you to create a set of ‘human’ bonuses or talents etc for balance. It always leads to a power creep (which I don’t think Conan could bear) and it suggests something fundamentally at odds within your premise.
I’ve thought about the same thing and I’d probably go with the following:
Use Shadows if the Past (my players have suggested double-applying this, do a base attribute of 5, for campaigns)
Maybe some attribute exchanges could be mandatory for some races, such as Brawn/Coordination for Elves.
The idea of racial Talent trees sounds nice, but I think some of yours are going to lead to OP characters. Using Survival instead of Ranged Weapons would mean half the cost of advancement for both skills. Where would the player spend his XP? Conan doesn’t really have the open-ended ‘Abilities’ concept that say D&D has, so new Talents have to stay within the existing framework of bonus d20, lower difficulty, substituting skills, etc. And that is whiteboard to modify without a risk to balance. Personally I wouldn’t go further than the odd Talent, balanced with losing something else.
Maybe Elves all have the Sorcerer Talent as a Homeland talent?