Ascendant already makes it so Rey was at Ach-To for a full night, you can just reuse and regrade scenes of her meditating on her visions, the dagger, & Exegol, figuring out where it is (recolor her gray robes white if you have to).
Better yet, have Rey follow the fleet to Exegol because D-O has the star charts to Exegol in its memory banks. Other editors have made D-O the ture key to getting to Exegol, so it’s not a huge stretch.