I agree that it should be subtle, more than the daydream even as you said, which is why I thought the drawings would be a nice addition. It would also solve the issue of having the Plutt lines without any visual context, and give some concrete examples of her backstory. The goal would be for the island to be merely a mental escape for Rey in this scene, so if the Force whispers happen, they would need to be quite subtle so as not to make it too mysterious or magical.

As for generating a new shot, I think without any dynamic moving camera the shots will feel too static for an Abrams scene, so the drawings were a way to fix that. I don’t think it would actually be all that much more work than the drawings on the static metal since the images would have to be generated anyway, and the type of shot I’m imagining is something I’ve filmed before. A darkened corner with some bits and bobs and the drawings would be quite doable.