I think the entire dyad fight would have to be overhauled for this idea to work properly. The reason for that is because Kylo is revealing information in the scene which makes no sense without the context that she is a Palpatine.
The only ways I can think of to solve that would be to completely eliminate the flashbacks and reveals for later in the novel (gutting the fight as a result), or to straight up reveal her true heritage in the fight. But then what’s the purpose of the hangar scene?
Ugh. I knew this might be an issue but I didn’t think it would be this hard.