As Dennis mentioned, you can simply talk to them on the phone. The Metallic Red I have is not an option either, however, they were able to do it and it cost the same as the Red Pearl. So you should be able to get it by contacting them.
As for the Red Python. I thought I was the only one looking for that.
That is expensive though - but would look awesome.
Keep in mind that if you get yourself a system over $4500, they have a discount for the paint job. You have to weigh it out. In my case, it would have been good as I would have wrapped the extra money into more toys.