I am not well versed in Peugeots, especially the french ones. Could you find the same crank with English threads?
I'd check with some local shops, even try auto machine shops about simply having your cranks retapped. It is my understnad you need fancy long lead taps to do the job. IIRC they have a long taper reamer on them to clear the old threads and then the section to cut new threads.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk