Maybe if you ask nicely at Bentley, they can order it in for you.
Bentley is the official distributor for Fender/Squire, so they are the best bet of helping you out.

But if you're looking for a squire-esque guitar, why don't you try out Yamaha's Pacifica? In my ears, sounds much better then a Squire and also MUCH MUCH cheaper.

Not really....... what are you planning to modify? Pickups? They are pretty much standard all around and any pickup will USUALLY fit any guitar.... Trem? That's quite standard too.....

Even Bolt On Necks arn't necessarily squire/fender exclusive.