This is a fascinating thread.
What a cool bike. It’s great that it was saved from the scrapper.
Is there much of a bike industry left in France? I.e. independent frame builders etc?
I have a 90mm high rise Tioga T-Bone stem, 1 1/8 inch diameter.
Can share a photo if interested.
You can also use a riser handle bar for an even more upright riding position.