I just went through this myself. I went to Alloy Wheel Repair Specialists, who have worked on my WK1 SRT wheels. Unfortunately, they said there is no way to repair it properly unless you strip it down and refinish. The shop on the west coast that can handle it for them said it would $350 per wheel since they will strip it, smooth the gouges, and rechrome.
They said there is a high chance they will chip more off while trying to smooth out the scratches. That being said, I bought the duplicolor black chrome kit and will be trying to sand and blend the gouge marks.
I'm mostly looking to smooth and blend so won't notice until a couple feet away.