I went though the same ordeal on the weekend. Instead of cutting the bracket I made one using some flat steel I had laying around. If you have a welder and a drill its quite easy and took about an hour.I removed the bracket that holds the rear foot pegs, only to find that the rear seat pad would no longer sit right.
The solution was to cut a portion of the bracket that holds the front part of the seat and reattach it to the frame. I searched the forum and nowhere does it mention this extra step in order to reattach the rear seat.
See the pictures below.