I’m not aware of any edition out there other than the original. It’s too bad, because it means that each person who wants to play this piece has to do hours and hours of the same work.
It’s not so much the pedalling, but the reading of this piece. It’s almost all in enharmonics, so you spend hours circling notes in pencil and more hours peering at them until you have memorized the music. It’s a great piece and worth the effort, but it would be lovely to have an edition in which the enharmonics were all written out. Maybe after the World Harp Congress is over, I might see if I can do it myself, but I wonder whether the copyright laws would make it impossible to publish.