Have you done the matching wood trim on the doors?
i started doing them, but hadn't masked the finger plate properly and ended up spraying part of the rubberised surface silver so just swapped them out for the standard, with the intention of sorting it later. below are a couple of pics of what the handles i finished look like.
dubbz, i got pretty much everything from halfords, primer, silver reflex paint, lacquer, assorted wet and dry. I bought 2 of each, but you could probably do it with 1 as i was planning to do the door handles too.
in addition to the paint i bought some gloves, masking tape and breathing mask from wilko
can't see any reason why it wouldn't work on the standard black, you just need to rub it down to a surface you can bind the primmer to.

