Adding a accessory ignition switch to a 65 C20

[Looking4shade]

What is the best option for adding a ignition switch with an accessory is it the 67 72 ignition switch or ignition switch out of a different Chevrolet. I would like to keep it stock looking with the flat switch but I see some at the car shows with ears on them I'm assuming that's to add the accessory ignition switch. I have a stock wiring harness in good shape but I could change it over to a newer one. I'm sure somebody has done this just looking for my best and easiest option. I drive the 65 everyday and the days I eat lunch in it I can't turn my radio on without it running . Thanks in advance