Nitromors is very slow but keep at it.
If you look at the "dawes escape" in my signature you will see I did the same thing and got good results in the end.
There is a powdercoating place near me that will dip a frame and repowdercoat for £75.00 though, so you have to ask yourself if its worth stripping by hand.
The lugs and tubes were bonded (fancy word for glued) instead of brazed. Powder Coating is cured at 400deg. Can the glue stand that temp before failing? I wouldn't chance it.
I'd worry more about a paintstripper dissolving the epoxy used to bond them, too.
Henkel own the Nitromors brand and since about 2006 all they've done is rape the legacy of working products they subsumed into their portfolio. Nitromors doesn't work anymore because the actual ingredient in working paintstrippers was restricted by EU legislation that came into force in 2008. If however you can find Starchem Synstrip with your google-fu, then that still contains naughty ingredient X. What do the Yanks care about stupid EU law?
Sorry I'm a bit late to this one...