SEM Texture Coating >
http://www.yourautotrim.com/semteco.html
You can fix the hole as normal on any plastic surface. Then before applying the factory color coat, put a few coats of the Texture Coating on. Coarseness increases as your distance from the surface increases. Make sense?
Further away you get.. Rougher the texture.
Then just coat with a color coat to match the rest of the dash and your golden.