Impossible schmossible! It took me less than five minutes to find a handful of auctions on French ebay.

Look PP65: Pédales "Look PP65" Français REF 104 | eBay

Look PP66: Pédales "Look PP66" Français REF 105 | eBay

Look PP75: Pédales "Racer Look PP75" REF 106 | eBay

Another set of PP75's: Look PP75 Pedals Pedales Vintage | eBay

And according to this seller, at least some of the pedals in this box also have French threading: Pedales Auto Velo DE Route Look Time Shimano ETC | eBay