First off, I don't know if the stuff you mention works or not. However, old style rust bluing is an iron oxide process which at several points in the process after boiling becomes black oxide. Parkerizing, on the other hand, is a phosphate finish. Parkerizing can come in multiple colors including a few greens which is the most common, but also different shades of grey, black and perhaps other colors I haven't seen or recognized as such.
If, as you say, your gun has large areas of finish to reclaim, I can't see how you'd get a good color match. Perhaps a green/black camo finish. Maybe I'd be unique enough to be attractive and tacticool.
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