You could strip the Aluminum off a VMKK. I made some light grey Haus by treating Chrome Haus with XXXX. The first was too concentrated and made the plastic yellowish but the second worked better.
If you want, I have an idea that would use different chemistry. You could practice it on some other, cheaper, LEGO parts to see if it affects the plastic. ?? Didn't think so.
Just saying... if someone sells you a discolored one it could be an altered VMKK