One more update for today.
Received a wheelset, handlebar + stem from a modern Koga Beachracer today. The big standout are the blue anodized hubs and flared handlebars.
On quick tubeswap later and the wheels were on the WorldTraveller. I realize this is not a disc frame (
though you might get away with an adapter in the rear) but nothing wrong with a set of wheels I might transfer to something else in the future.
Blue hubs on a potential red frame are quite the contrast but I do like things a little more colourful.
It was also a good excuse to try out 35-622 tyres and I think there's plenty of room for 37-622 with fenders, which should make for a comfortable touring bike.