Okay, so this is most likely excessive, but hear me out.
If we’re talking canon here, Rey’s father is less of an actual son of Palpatine, and more of a “son” in that he is a clone originally created to eventually house Palpatine’s consciousness. Since this edit is already emphasizing the cloning aspect of Palpatine on Exegol, it would be a real “chef’s kiss” moment if Rey’s father was deepfaked to have Ian McDiarmid’s facial features. It would also help remedy the fact that, because of how the theatrical movie plays out, we have all imagined old and disfigured Palps having sex with Rey’s grandmother and those thoughts are best kept in the recesses of our subconscious.