Krausfadr, regarding your idea:
So basically, Snoke/Palpatine senses her future as a potential threat, and ordered to have her killed. Kylo went to complete this task, found the parents and they gave her up immediately. Kylo, I’m assuming, sympathized with her abandonment, so he killed her parents and left her on Jakku. Is that correct?
Yes and Kylo also felt a connection with her beyond just her abandonment. Or the order could also have been to bring Rey before Snoke/Palpatine as she was a possible better apprentice than Kylo.
It might be hard to shape the right dialogue (you should look into those voice emulator AI programs, I know there are open source versions of it, or find a good Adam Driver impressionist maybe), but maybe the Knights of Ren were tasked by Snoke to hunt down various potential Force-sensitives and eliminate them (maybe that’s why we haven’t seen the Knights in the past two films). Kylo specifically was sent to Jakku.
If you have trouble making it to where Kylo kills her parents himself, maybe Ochi was a servant of Snoke, and Kylo ordered Ochi to kill them, and then he killed Ochi and left him on Pasaana. You could create a shot where helmeted Kylo is on the ship with them. That way you can keep the connections with Ochi, the dagger, and her parents, but still make it related to Kylo Ren.
I think Dom’s idea was similar to this, minus Kylo’s involvement. Rey’s a nobody, but Palpatine sensed her future and orders her killed. The one benefit to your idea is that it still frames Rey’s parents as shitty people who didn’t die to protect her, and it gives a good reason as to why Ochi couldn’t find Rey.
The one downside is this would mean Ben Solo has been Kylo Ren for at least 10-12 years, and he would have to have turned when he was a teenager. But I guess nothing in the films really gives a definite timeline on the history of anything, besides how old people look in flashbacks.