Why not start with LWW as season 1, then have season 2 be episodic based conversations between the professor/Digby talking to the Pevensys about MN and the origins of Narnia? That way the main characters from s1 would have ongoing appearances throughout s2 in the lead up to s3 Prince Caspian. It would also allow for references to A Horse And His Boy, plus new material about the Pevensys time as King and Queens of Narnia.