De-Nickeling?

[Zamo]

Once a Luger has been nickel plated, can it effectively be "de-nickled" and re-blued into a nice looking shooter (assuming it was nice looking in the nickled state, ie: Proofs and stampings)? Or is nickle plating some sort of metalurgical electro-imbueing process that can't effectively be reversed?
My whole thought is for a decent looking (that is non-shiney silver) shooter. I keep running across guys with nickle platted, but otherwise very nice Lugers, and was wondering if it'd be worth "saving" them. What would be too much to pay for a nickle luger with this in mind?
I figure you'd have to get the pistol for pretty cheap to make it cost effective versus just buying a re-blued shooter to start with, but it makes for an interesting topic of consideration.