Marc, had my window trims polished (Nyphos, Crewe) and then anodised at the same place as yours - satin finish, circa 15 micron. Not particularly pleased with the outcome, whilst alot more consistant than yours. the satin anodizing stands out against the bright chromework I have on the car and it has a fine speckled finish when viewed under light. Also, on one piece of trim, whilst polished, the previous top coat (anodising?) was not completely removed and I now have one piece marginally two tone post reanodising. I'm not sure what the answer is re these trims, other than hoping that BMW will reproduce one day! Either way, its been a costly exercise.
My light surrounds and centre trim piece were rechromed some time ago, I went down the same route using 2 part epoxy to cement back in. I encountered a thicker chrome coating which made my lenses more difficult to reinsert.
JP
(for the observant; race car hence plastic rear window and boot strap mount)