I don't think it is hard to replace... but it will be rather expensive. You'd be better off waiting for some RDXs to hit the junk yard after being wrecked to get the pieces much cheaper.

Also... are you sure you want to start disassembling a brand new vehicle, so soon? Not saying don't... but most people get terrified of the thought!

Likely yes, but you'd still have to remove all the pieces. I'm not sure how the chrome trim near the bottom of the door is attached. It's either just glued in place, or bolted through the door (meaning you'd have to take the interior door panel off, as well as the vapor barrier behind it), or maybe even glue and bolts. Who knows at this point.

Either way, to take all those trim pieces off will require a good amount of disassembly. It's definitely doable. I believe the chrome around the windows can only be taken off once you remove the interior door panel. You might even have to remove the window glass. It's hard to tell until we get a copy of the factory service manual to see what is required.