As someone who thinks TLJ is the best of this Trilogy (Yes , we exist), I have a minimalist edit in mind.

The only thing I would change for TROS would be to remove Rey being Palpatine’s daughter. It didn’t bring anything to the movie and it would make her taking the Skywalker name an even more powerful moment.

It should be relatively easy. You just remove the instances where it’s mentioned. Rey’s parents were killed because Palpy sensed her immense power (Which came from the Force itself)and tried to find her for his next vessel.
The fact that she’s afraid that she could become a very powerful dark side user can still work. The Force lightning scene could also be kept.

That’s my idea after a first viewing. What do you think?