Benelux Tourist is on Ebay.co.uk for around £160 - £200 so that may have to wait for a while.
But there are some suicide shifters.
Claims to be Cyclo but I can't match it with Velobase:
"MISSING ITS BAND ON CLAMP, THOUGH THIS WOULD BE EASY TO REPLACE"
Not sure I would believe that.
On the upside I've worked out my frame only had one chainring originally.
Bottom bracket has a Bayliss Wiley no 23 axle which is apparently "Single ring with derailleur"
from
https://www.classiclightweights.co.u...acket-lengths/