+1 on
gugie 's suggestion in post #6.
Red Clover Triplizer w/ 28T inner
You *might not* need a longer BB spindle:
We have clearance, Clarence!
Mine shifts well with my original Suntour Cyclone front derailleur, to boot. I changed the rear derailleur to a Suntour V-GT Luxe, and the whole setup works pretty well.
My geezer gearing mods.
No historical hogwash; we're fixing our bikes here.