I have also long been interested in this topic, due to the fact that Mrs. Darling says in the novel that the Peter Pan she had heard of walked children to the land of the dead so they didn't get scared.
The interpretation as Neverland representing death does exist in some form because it's used in the film Finding Neverland. Barrie's brother, David, died young, which had a substantial effect on him. In the film, Barrie says "I used to say he'd gone to Neverland." This idea is used again at the end of the film, as Sylvia's death is symbolized by her entering Neverland. Playing off this interpretation, one could say that if Neverland is the land of death, and Peter is it's ruler, he is a personification of death, but I don't know if anyone has actually gone that far. (Though in Zenoscope Comics' new Neverland series, Peter more or less eats children, which makes him and Neverland deathly, but it's not a plainly stated interpretation, as it is in Finding Neverland.) I don't know if there's anything else, but if I run across more, I'll be sure to let you know.
(Also, off the subject of Peter, have you looked into Terry Pratchett's death?)