Cutting, beveling, and drilling isn't a road I am eager to go down right now.
Trimming a pair of aluminum rudder pins is incredibly easy and only requires basic hand tool skills. With a sharp hacksaw blade and a decent flat file, trimming and deburring can be done in a matter of seconds. Having a bench vice helps too, but isn't absolutely necessary. To drill the cotter pin hole, first use a centerpunch to keep the drill from wandering. These are tools that you'll continue to use throughout the the ownership of your boat (not to mention the rest of your life). Really not a big deal at all.