I think cutting Rey Palpatine is doable. At the very least, I think you could imply that he “influenced the midichlorians” to create her. Almost like a reverse Anakin. An anti-chosen one. If this was the case, the audience of Sith loyalists would add a lot of weight to that. In my opinion it is better than her being his literal grandchild, and it would mirror Episode I, where Anakin was introduced as the chosen one who was born from the Force.

I still would prefer Rey Nobody, but I think the former idea is doable at least. Just changing/cutting some lines.