Yeah, unfortunately I reckon it will be. Obviously Wez or Feline would know for sure, but I'd say it'd take a serious bit of woodworking to replace the locking nut with an Earvana. You'd probably also have to fill the holes through the neck where the locking nut is currently attached.
Locking tuners are pretty good. I've got Sperzels on my Soloist, and although it doesn't have a Floyd, just a Wilkinson set up to give about a 1 and half tone upbend, it stays in tune pretty well, even when I'm quite vicious with it.