Bring it up to Trinidad State Gunsmithing School. Dunno what it'll cost, but it won't be a thousand. You supply the barrel though.
Second semester does the cleaning and can reparkerize it. BTW, I saw an engraved shotgun that was re-blued by the instructor who teaches bluing/parkerizing and browning. The owner was afraid that the engraving would be removed. The instructor polished it by hand. The end product was outstanding! (OK, he had to do the barrel twice because one part didn't take the blue very well).
Provided you supply the barrel, the new barrel can be installed there and then chambered to mil-spec (on civilian guns they hold us to minimum SAAMI specs so as to have match chambers).
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!