I see, well tone it down, twice or trice the human learning speed would be enough.

Wait, there is one way for him and the country to be here! I could put the continent (quite) south of Talga, with a mountain range in the northern part of the continent isolating it even more. But that means that your character would need be to be someone capable of navigating a ship or part of a expedition to Talga islands and then to some more civilized place, for example a Alagorian trade port in Loraya. Does this work for you?