I spent a couple years watching ebay for a 175 Stronglight crank for my PX10. At some point I gave up. Then one day I just randomly thought about it and looked. There was an auction for a nice clean 175mm 93 crankset closing in like 30 seconds. By the time I got signed in, it was gone.....

FWIW there's been a 175 Nervar on ebay for some time. It's not quite right, but would not look out of place on a PX10. Too bad about the 128BCD though.