Her being Uranus wouldn't work. We already more or less know what Uranus is. Its whatever Imu used to destroy Lulusia.
But she could definitely have a connection to Uranus, like how Momo has a connection to Pluton, being that he can awaken pluton by having Zunisha destroy wano's walls.
Similarly, I think Bonney could use Nika's heart to power Uranus, as we were shown that Nika can power the ancient robot.