I don’t think any rewrite would be needed. Almost the whole season was filmed not knowing it was the last. The few scenes they filmed with that knowledge were just to put a nice cap on the series. Probably something like the last scene in All Good Things, which wouldn’t have prevented a TNG season 8 if the winds suddenly changed.
That said, I think the most we can hope for is for this to encourage them to incorporate more Disco elements into Academy. I don’t see them backing down on this being the final season.