Best I can do so far. I can't figure out how to get rid of the chrome and make it look like paint. Hopefully the wizard will chime in and explain.
The only thing your missing to make it look like paint is some color. I did exactly the same for the chrome color, started with black and some blue/green until it color matched the truck. Notice how the bumper looks like a completely different color than the hood. If you blend between the two colors it will look like freshly washed paint. In this case, Tommy's truck is clean enough that the paint would reflect the same as the chrome, minus some saturation.
Here is the color profile I used.
And here is the effect.
Now going between glossy and matte finishes is a complete monster of a task. If the paint is dirty and you want to de-chrome or go from gloss paint to matte paint, then there is no process. There is no simple way to mimic that in either direction, each situation will be unique and require a lot of effort to get it to look right. You might get lucky and a surface blur layer may work, or you may have to paint the entire thing by hand, there just isnt an easy way to do it.