Sure if you pull the bumper, overhaul it completely, charge for flex, color sand, with a normal labor rate, yes it would be upward 700-800.
All I am talking about it is a spot job (no warranty). No overhaul, just mask the left side of the bumper at the body lines. The sanding and prep is quite minimal compared to a proper warrantied job. Maybe Id go upward towards 400 because of the color.
Do I recommend doing this to a new truck you plan on keeping for 10 years. Probably not. If you plan on wheeling it hard and scraping up the bumper anyways then yes.