Yeah i get what you mean.
But honestly? Dont seem like much problem to me ...
As long as you never pick any [Baldurian] dialogue choice ... so far it seems like you are prefectly fine as Outlander.

Also ... i can quite easily imagine person who was born in Baldur's Gate ... therefore have Baldur's Gate origin tag ... but spend last decade or two in the wilderness ... therefore have Outlander background.
