I haven't heard about Model 3 seats, but I've heard that some people have swapped out their seats for newer Model S ones. That might be an option for you.
You could also try taking your seats to an upholsterer and see if they can add some padding or shaping to them. It might not be as...
Not me, but my friend tried the satin black and it looked stunning! It's not something you usually see. He lives outside my city so I can't take apicture but here's what I saw online.