Geez Louise, just space the hub to 126 and buy a 13-28 or 14-28 used Shimano UG freewheel on eBay or get one from Pastor Bob in NH at the Freewheel Spa.
3mm wider on each side means it's easy to slide the wheel in using slight thumb pressure without cold setting. I do that kind of stuff all the time, don't even have to realign the dropouts (unless you're sensitive to a half degree of change in dropout angle), shifts extremely well.
SRAM PC870 chains are my Go-to choice for friction 6 speed doubles and triples. Also replace the pulley wheels with Shimano 10 tooth ones or newer sealed bearing Bullseye ones. Nice, crisp, reliable shifting.
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