Of course, because they won't hear the dirty great big lumbering series 3 at night will they?;)
I would imagine you could buy any enamel paint for a vehicle tinted to those colours couldn't you? Doesn't have to be the current military stuff. Would be far easier. I would think any panel shop or purveyor of fine automobile paints could custom tint what you wanted from a sample. I've had this done before.

