I have this idea now that there's a legend, or saying, or something, in Narnia that those who have been in the grasp of evil are the best rulers, in the tradition of Edmund, so "disenchanted" is meant to be a compliment to Rilian. Of course he doesn't think so.

Oh, I love this headcanon! It fits so well in a Narnia context, and you could do a lot with it. So definitely run with it, if the inspiration strikes you.