Hmmm. I see what you’re trying to do there - giving more reason for the ending scene. But the revelation isn’t particularly shocking for Rey to hear, which is how she reacts in the hangar scene. Plus, most people wouldn’t believe her so it really wouldn’t spead around enough to reach Palps. And even if it did reach him, why would he actually believe that it was true despite so much evidence to the contrary (Luke is committed to being a Jedi, Han and Leia only have one son).

EDIT: I’m also not sure why pushing her in the desert was supposed to hint all this to her. Clearly that line is referencing some sort of innate darkness about her.