I have a suggestion, do not retain the idea of Mr. Rey (not a Finding Nemo reference) being a clone of Palpatine. Rey being the actual granddaughter of Palpatine - a familial, hereditary connection between the two - solidifies her belief that her being his blood, direct granddaughter is the reason she is continually giving into the dark side, that no one is going to give her any validation because of her heritage, you get the idea; not to mention in the actual film it streamlines Palps’ motivations…

Palpatine is suffering in a clone body and hopes to possess a Force-sensitive, so he decides to conceive a child, acknowledging that biological children are not clones in the way his failing body is, hoping for that child to turn out to be Force-sensitive; his son, however, turns out to be a non-Force-sensitive — the mere fact alone he does not teach him in the ways of the dark side implies he is not Force-sensitive, and if he were Force-sensitive then the events of the sequel trilogy would not have turned out the way it did.

The man goes on to conceive Rey with a woman, Palpatine goes after her, the man and woman abandon Rey and the both of them are killed by Ochi, and Palpatine goes after Ben Solo instead, yadda yadda.