My understanding is that any SureFire Dealer can order special runs of things from SureFire. They just have to order enough to make it worth SureFire's while, and that may be quite an investment that the Dealer would have to be confident they will quickly be able to recover by selling them.
Also, SureFire are busy so production of such a custom batch would need to fit in with their schedules I guess.
For example, SureFires can be custom laser etched, custom colour anodised, or have a different combination of parts such as 6P's supplied with the Z59 Clickie TailCap instead of the standard LOTC. Or, a load of KL4's could have the E2d's Strike Bezel ring installed. Or, they could make up an accessories kit package or something.
If they want something more exotic I guess it would be more complicated to arrange, and more costly. I suppose that some dealers may take a more active interest in what SureFire is up to behind the scenes and be able to realise concepts such as stainless steel Strike Bezels and fancy body styling in limited batch productions.
Al