I had also thought to suggest showing the TFA duel in the vision, reframing it to imply she unknowingly used the dark side to defeat Kylo. I do think using the Sith eyes would be a bit too on the nose, unless this was a follow-up to Starlight. I think it’d work to just show Rey striking Kylo down paired with Luke’s “You went straight to the dark”, then followed by a shot of Rey falling down the dark side hole and/or inside the cave.
Use Finn’s “Noooo!” from Chewie’s ‘death’ to begin the vision, similarly to the way baby Rey’s worked originally, or Finn yelling “Rey!”, though that’s become a bit of a meme.
Incorporate Obi-Wan’s line “you will be tempted by the dark side of the Force” which could be faintly heard in Rey’s TFA vision (maybe keep it equally faint and echoey).
Use Kylo’s line “You’re still holding on! Let go!” as we see the lightning blast from Rey’s hand (it’d probably be better to leave “join me” instead, to keep the parallel to Kylo’s vision and set up all the talk about holding hands, but maybe both could fit?).
I really like all of this, especially the idea of re-using the TFA duel.