the aluminum trim around the doors are VERY VERY expensive... It can be removed and replaced if you are VERY careful... have a Qualified reputable body shop do it and you should be fine.
To the OP about dent - if it's real bad you'll probably need to replace it - the aluminum is so thin that any attempt to work it back into shape will most likely make it worse...
I went through all this a couple of years ago to do this to the car... this was plan D by the way, the first 3 ideas wouldn't work - which were black chroming, the guy that does my emblems wouldnít do the trim (even though I have found a resource that might work since then, too late for me now), second choice was powder coating a black chrome color (molded plastic behind the aluminum nixed that idea - didnít know until trim was off the car), 3rd choice was anodized (since the pieces were off I had to do something, but the belt molding has molded rubber and most anodizing shops wouldnít do it, a couple said "maybe" but wanted test pieces to try first - I didnít have access to "test pieces" and the car was sitting at the body shop for several days by this time)... final decision was paint.
Here's how it turned out (pic below) - not what I wanted, but I still like it better than the polished aluminum (for my car)... The car has a grey theme, which is why I went through so much trouble (believe me itís a PITA!!!)... there is nothing shinny on my car (no offense to anyone else, I've seen cars that look great with polished aluminum all over and chrome - I just went a different approach).