Ya, you can cut the existing rudder in two and add a rudder head made of aluminum plate. A real simple method is to do what MacGregor did years ago with their 22' Venture. If you can find one, then you can see the shape of the cut they made, where to drill the axis hole for the pin, etc. I can't draw a picture in this box, but if you look at some other brands of boats that have a kick up rudder you can get some shape ideas and how to make it work.