I was thinking of something like that : https://donpedrobrooklyn.com/wp-content/uploads/2017/08/oute...
But in a right scale. If the earth has a scale of 1/10th of a dot, that would be a bad decoration
You mean Neptune and Pluto's orbit is so eccentric that it is sometimes closer to the Sun than Neptune.
Uranus is 4.5 billion km from Sun and if, for the sake of simplicity, the model is 4.5m wide, that would mean that Earth with its diameter of ~13000km would be a speck just 0.013mm wide. That should be 1/10th of a single dot at a resolution of 200dpi if you are planning to print a map (one dot at 2000dpi but good luck printing that;). You might want to consider adding an arrow and a label.