Originally Posted by John E

I presume/hope you are being satirical.

It is not difficult to convert a Simplex hanger to take a SunTour or Campag. derailleur. At any rate, I strongly advise against doing anything irreversible to the frame. You have a nearly-complete/original top-of-the-line Peugeot PX-10 equivalent in a somewhat rare color -- definitely worth preserving.