If you decide to paint the insert...

Make sure you wipe it down thoroughly with lacquer thinner. AmourAll is one of the biggest enemies against new paint... it contains silicone, which will cause "fish eyes". (looks as if the paint is scared, and won't adhere to that particular spot)

Due to the sun/fading, I suggest painting with a basecoat/clearcoat combination. Clear contains UV protection, so it won't fade in a year or less.
To get that satin look, you can add a flattening agent into the clearcoat. A little of that, more or less, will give you different levels of sheen...