That's not possible. Blue is a solid salt that dissolves in water and is applied at a temperature, it causes a reaction deep inside the pores of the metal. Parkerizing is a liquid that dissolves in water and is applied at a temperature...different to blue. It forms a crystalline structure on the surface of the metal. It's far more durable than blue thus being adapted for military weapons. The surface for blue must be polished and fine, or you get a matt finish. The surface for parkerizing should just be bead blasted or sand blasted and gives you a corresponding finish. If you try to put one over the other, you'll end up with a surface that resembles a calico cat's coat, except not fuzzy and pet-able.
As suggested, just ship it to BDLand he'll make good and return...