If “Rey Palpatine” is removed somehow, what is the motivation of Palpatine to have Ochi try to find Rey and kill her parents while doing so?
Simple, he senses Rey’s power in the force/her potential in the dark side, similar to how he sensed Anakin’s potential. You might need to an extra line or two culled from elsewhere to sell this, but imo it’s a much less convoluted explanation.