Another nice idea. I was planning on having some of the Exegol scenes moved later but in flashback. But having a race of both sides to Exegol is interesting. You can still have some kind of Kijimi revelations because Kylo is in communication with Palpatine. He just hasn’t physically been to Exegol to man and retrieve the fleet.
By kijimi revelations I meant Kylo revealing that Rey is a palpatine, which wouldn’t work since in this restructure he has yet to find Palpatine.
Alternatively If you wanted to go the Rey Palpatine route you can have Kylo find Exogol before he appears on Kijimi.