I finally finished my 650B conversion tourer. Bought it as a stripped frame project with a box of parts, and finally identified it as a 1983 Raleigh Touring 18 that had the cantilever mounts moved to 650B.
Powdercoated the frame a deep metalflake purple.
Added racks and porteur bars.
Added Raleigh-branded Suntour ratcheting bar end shifters.
Added Brooks B17.
Original first-gen Deore Derailleurs.
Original Dia-compe canti brakes.
Original Tourney AD triple crank 52-42-33 and bottom bracket.
New everything else (wheels, headset, cables, etc.)
It rides like a dream.