It seems like once a vintage French bike that requires those sorts of components the Japanese collectors covet gets parted out, it almost makes better sense to pitch the frame into a dumpster than to try to do anything halfway correct with it. The restoration cost will far exceed any value the finished project will ever possess. At least this one doesn't need Juy 543/53 changers to be correct. I reckon a vintage PX or similar bike that needs those pieces is pretty much worthless once those derailleurs are removed and sold off.
Kurt Sperry
Bellingham WA
USA