I had the same and took them off (pretty easy to do); cleaned them up; sanded; and re-sprayed them in matt black Halfords Very High Temp aerosol paint. Just under £8/can.
Seems to be fine. I don't claim they look particularly special but actually, I'm fine with them being understated.
It seemed to me that gloss is always going to be a problem to keep shiny, especially in wet UK weather. So I conceded that matt is probably a realistic compromise. I had considered red (to match the panoply of tail lights/reflectors) or 'M' blue-blue-red, but life's too short to speding too much time on this!