I just got my first double-white a few months ago. I'm really warming up to it as a nice alternative to the standard black. It does however, need the right color guitar and/or pickguard to work.
Getting a UK or western-EU dealer to order any "floor customs" is blood-out-of-a-stone work and when they do agree they always slap on an extravagant premium of their own; I've ended up waiting for creations I want to turn up on US eBay and importing them, as even with the shipping and import fees it ends up being a lot cheaper than getting a local dealer to make the order. I don't know what can be done, if it's a matter with a middleman distributor or what, but I hope SD can work out something to make custom work more accessible to the EU(and/or UK). Hell, even just getting a nickel or gold covered pickup is a bit of a mission here...
Though FWIW my "floor" white-and-gold Invader and gold-covered, black pole Full Shred set are my favourite pickups in my collection, period.