Vintage Peugeot conversion help and tips please

someday, it sounds like you have the same crankset I had on my peugeot. You can drill the rivet things out so the back chainring comes off. I rode like that for about 2 weeks before the chain ring bent from the pressure of fixed. I would recomened a new crankset!

After drilling out the rivets to make it into a single chainring exactly the same thing happened to me too - sorry for recommending it to you Mikey Mike! If you search around in the shopping section you can find some pretty good deals on cranksets and chainrings; I would advise doing that instead. Best of luck!