Easy , the pin is just a riveted end , disc grinder will do the job in seconds, carefully grind away the from the underside of the pin , tap the pin out , get a new spring and just get a Cap head stainless Allen bolt and a lock nut. Add a drop of Locktite Blue and tighten it up until the peg will not overcome the tension of the new spring, back the nut off a tad until the spring tension is sufficient to over come the resistance so the peg will snap back. I fitted a lowering kit set of pegs to my FZ1 so I know this method will work .
Lew