I just think it is too complicated. Her being a clone of Palpatine or Luke makes little sense. By definition a clone is a copy of a person. So Rey would need to be a copy of someone that looks like her.
Sure, you could say she has Luke’s DNA or Palpatine’s DNA, but at that point is she really a clone? I definitely think even if you could make a good argument for that, it would be just too confusing for the audience.
Maybe Kylo could say, “Palpatine made you.” to imply she is some kind of genetic Force experiment, like an anti-Chosen One. And maybe there could be failed clone experiments of Rey in those tubes. But it still raises the question of who the original Rey was.