I agree with the general consensus that Crocodile Cacophony would be much more fitting for a hype reveal trailer, since the song itself is much more suspenseful and menacing. Though ideally I would like a little bit of Gang-Plank Galleon to be incorporated into the music somehow, since the song is so iconic.
If Gang-Plank Galleon does become a stage, I would hope there will be more to the stage then just a generic, vast ocean. Perhaps maybe the entirety of Crocodile Isle should be the background of the stage, with hopefully an accurate depiction of the many worlds on the island (or better yet, possibly a traveling stage where you visits different parts of the island, including a docked Gang-Plank galleon?)
While it is highly unlikely that The Flying Krock would be used for K. Rool instead (Gang-Plank Galleon is much more iconic), I don't think I would mind at all, as The Flying Krock would be pretty impressive as a stage visually.