We’re entering the territory of personal interpretation at this point, so I think we need to go back to the line itself.

“Because you’re a Palpatine? Nobody can claim those the Force made. That choice belongs to you.”

Is there any particular reason that this doesn’t work? At least from my perspective, Rey’s destiny is intertwined with Palpatine’s claim over her. So we essentially get the same interpretation out of this without opening up this huge can of worms concerning destiny in Star Wars.

EDIT: One other thing worth noting. Notice how Rey doesn’t say that her greatest fear is ending up on the throne. She says her greatest fear is herself. This is why Luke’s response directly has to answer why she as a person is not the same as Palpatine. In other words, this definitely isn’t the time to steer the conversation back to her vision/destiny.