Due to its glossy nature and plastic look, are very minor scratches likely to come out of the painted interior trim pieces by buffing or some method?

 

Can you post a picture?

Can you removed the painted trim piece that is scratched? It's going to be difficult to get a buffing pad on a small interior trim piece, and generated leverage & pressure,to make a big enough difference.

Talk to Eric at BumperPlugs.com, and see if he can get you a painted replacement piece. Or remove your piece, and send to Eric for re-finishing.

 

In short, yes they can be paint corrected like paint. The hard part is going to be getting enough leverage on them off the car. You can use a micro buffer to do so and then protect with xpel once done to avoid future scratches as they make a precut kit for the interior pieces.