But we can only make graphical changes. There would be no implication that the rocket is the reason that the pearl appeared, except that experienced players know that the puzzle works that way. We can't even add or edit a text notification.
we dont have to edit the notification since we dont edit text on other puzzles (alchemy lab,sharks)
I'm sorry, I wasn't aware that you were working with LinuxGNUru on this. But it's not, "We don't have to." I think you mean, "It's impossible for us to."
My point is, nothing ever implies that it goes anywhere, or retrieves anything, unless the player reads the mod's readme files for an explanation. The only way the player knows they're connected in any way is because the player already knows (if they've completed the statue puzzle before) that this is how the puzzle works.
This is no different from the original statue puzzle, true, but I just don't think it's helpful to create puzzles that look functional, and then never seem to function.