Not impossible at all:
1. Apply Bare Metal™ or similar foil to the area.
2. Use a pencil eraser "sharpened" until the end is about 1/16" or 1.5mm in diameter
3. "Twirl" the eraser on the foil to create a circular swirl.
4. Move the eraser about 1/32" and twirl in another circle.
5. Repeat by moving in even rows until the surface is "machine turned"
Its really not as time consuming as it sounds. You could probably do the entire front of "Spirit" in a single sitting.
Phil Schenfeld