Yes, that scuffed trim can be brought back to look like new provided you find someone skilled enough to make that happen.
The trim could also be chromed, but the first step would likely be polishing to a good clean metal, then copper filling, then the nickel and finally the chrome.
I would think that a good chrome shop could probably do the stainless restoration and you might want to approach such a shop first. They can probably refer you to someone else if this is out of their norm.
I do not think the trim could be polished with it still installed on the car. Removal of all the trim is quite a chore in itself. The windshield gasket trim cannot safely be removed from the windshield gasket unless the entire gasket/windshield assembly is removed. The trim is installed into the gasket prior to installing the assembly into the car. The trim has a J hook edge that locks it in place.