[quote ] Do I pony up the time and money to slow rust brown it, [/quote]
It really doesn't take that much time,,a week, maybe ten days. quicks link to the LMF page gives ya all the direction ya need. When they start talking about moisture and a tent an stuff, well I always just called it a "sweat box". All I do is get a carboard box,, cut a few more layers of cardboard to fit on the bottom, then take a piece of two-by under the tang end and a dowel down the oiled barrel out the end of the box,,make the inside of the box really wet,,aka: sloppin wet put a cup r two of water in there slosh it around. If the box collapses because it's two wet,,well then take that as a lesson and git another box. Wait 24 hours,,but most folks can't, then follow directions.
If you oil the bore and plug it like the directions say, you can't mess up rust browning. If ya don't like what's happening,, just sand it off and start again.
I always scrub the finished product with a bakingsoda paste and rinse well,,dry and oil heavily to ensure all the rust starter acids are removed.
Try the "rust", it's easy,,,