It's worth noting here that altering the bike's geometry a lot and shortening the stocks will massively affect how it drives and how well it can lean. In other words, it will become a worse motorcycle for it. The place to start is narrowing the seat and shaving that, or getting a very low-profile seat made, and seeing if there is any way to live with having to hang a leg over the side to hold the bike up. Just one man's opinion, obviously.