FRP won’t really impact the price, bare carbon cloth isn’t terribly expensive anymore. It’s the time to lay it up, trim, clear, clean up, package, ship etc that dictates the price. Still have to use resins, and FRP might need an extra layer to be as strong increasing the complexity.
I’ve had a few customers paint theirs, the recent white car built by Eccentric Motorsports is a great example of this. Just because it is a carbon part doesn’t mean you have to show the world. They look excellent painted, much easier to reverse compared to welding it up but with a similar effect.