the locking nut removers will NOT remove the peugeot lock nuts if they are like the ones below
http://cgi.ebay.co.uk/Genuine-Peugeo...item483c30544d


as for welding a nut on that wouldn't work either as the centre pin in the pug ones are like a shear pin

your best bet is go to peugeot and see if they have a master set