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@jsabine
I'm not quite sure what the problems you're facing are, and how replacement of the rear triangle might cure them.
If it's rear dropout spacing, brute force to bend out the stays is the approved method of adjustment - cold setting, if you don't want to frighten folk off ... Sheldon Brown has a useful discussion of issues and methods, and also talks about how to ensure the dropout faces are parallel afterwards.
You also mentioned filing the dropouts - is this because it is (say) a 9mm dropout and a 10mm axle? I wouldn't hesitate - and it seems to me a bit less brutal than ripping the poor thing apart only to rebuild half of it.
Obviously having a play with brazing seems as much of a motivator as simply getting the bike running again, but TBH I'd be more inclined to get some tubing and lugs from Ceeway (and probably a metric fuck-ton of their practice lugs and tubes as well).