In 2000 the story was made into a short (33 minutes) children's film, retitled The Pirates of Central Park, and reset in New York City. Names are changed, but the essential story is kept intact. And so is the voice--the original story is narrated by one of the boys, and much of Dunsany's words are retained. The film features a young Jesse McCartney before his teen boy singing career.
Dunsany's story is rather an uncharacteristic tale by its author, but its adaptation to a film works fairly well. I saw it on YouTube (link here).