For a Rey killed her parents storyline, the main issue to crack is you have to make Ochi’s ship be a different ship (same model) than the one her parents were in. To do this in my edit, I made the ship in her vision a different color, which some viewers thought was a mistake since it is a different color than the original vision from TFA. So the better option would be to change the color of Ochi’s ship.
To flashback to the killing of her parents I had a force lighting sound play as ship debris crashes to the desert floor. Feel free to use any ideas (or not) from my edit which is a Rey Nobody killed her parents edit. I’m not going to be updating it any further. Here’s my change list: https://krausfadr.wordpress.com/resurgence/