I special color ordered my E46 M3 in Sterling Grey - cost me 2k - the sales associate can handle this for you.
It adds about a month to the order process because they have to group a bunch of special orders together to do it.
definitely doable. Just have to push a little. I think they need to ask for Regional Approval by BMWNA.
but to be honest.. saw the A52-Space Grey Metallic IRL and it looks almost identical. Looked good with FR leather... only problem was it has the aluminum trim!