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2- if the mirrors are glued check out this thread for glass removal (Fixed my flopping outside mirrors today)
3- Find a reputable coating shop in your area and have them powder coated.........several options for the black finish.....gloss to flat.
4-reinstall........
Easy method would be take the car to a body shop and tell them you want Black mirrors......
Easy self method would be to mask off the mirror, cover the rest of the car with plastic..... sand or rough up the mirror with a scotch guard pad and paint it yourself.......glass down....door open.....would also recommend covering the opening to the car so you don't get over spray in the car while you paint the mirror housing. For sure cover all of the door..........this would be a tedious and detail job but a fun diy project.....