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Velo Orange do French threaded headsets and bottom bracket (not that you'd need them as the ones fitted seem fine) . The trickier thing to source are stems as these are 22mm rather than the standard 22.2mm. Sheldon Brown suggests that it's not a problem to sand the extra 0.2mm off a standard stem.
More information here:
https://www.sheldonbrown.com/velos.htmlThe plus with these era of French frames is they're designed for 700c wheels rather than 27"
Let me know if want any more info or pictures
Tempting...
Not too sure about the implications of French thread- how hard is it to find parts?