I think green would actually be nice.
Dont bother refurbing. Spend your time colour coding whilst searching for some ph2 alloys
gloss black. matt seems to look bit greyish when out in the sun. gloss black will look brilliant if you get the last coat and surface spot on. a nice bit on wax and elbo grease will make them stand out.
be warned. when painting the badges make sure you use 1500 grit or higher to key the surface smooth and use a quality plastic primer to prep for your colour choice.