Instead of giving Rey only Leia’s saber, Luke gives her the entire Jedi Council’s lightsabers. She immediately attaches them all together like whiteboard markers and starts twirling the resulting mess of a staff while singing Duel of the Fates to herself as Luke watches on awkwardly with the look of someone who is just so tired.
It would be so easy to cut together “You’ll take a thousand sabers to Exegol” from dialogue already in that scene.