I didn't know about Braxton doing Campy-Alpine Gearing conversions but it doesn't surprise me. He was throwing together some top notch tourers back then; many built with 590 wheels (26x1 3/8). The famous Spence Wolf at the famous Cupertino Bike Shop was famous for doing conversions like this. He did them for Cinelli bikes no less. This photo is from around '73 I believe.
The Suntour VGT Luxe came out about this time also. Once these guys were available there was no holding us back. So Patrick it was a desert here in NA, primarily because stuff was hard to get. Either you got custom conversions like this (if you knew about them at all) or wallowed in anticipatory angst waiting for your Suntour (introduced in early 70's).
Hey Robert, speaking of "bikepacking", check this out. Published 1981. This is the one that got me started. We don't need no stinking "gravel" bike.