About all you can do is paint it ,only problem is it is made of stainless steel and not a lot will stick to it .I painted the trim for a 70 sport roof quite a few years ago and it lasted for a year or two then it started to peel ,i even sanded the trim . Not sure if powder coat would stick either but it may if you sand it first .
powder coat or plasti dip for a semi temporary color change. We have been ceramic coating trim for a while and it is pricey but holds up extremely well.