JcWhitney.com used to sell a electric horn kit that was programmable for several sound. Don't like one sound? Try another. The advantage is you probably can power it through the normal steering wheel horn button.
It would be a simple install, just find the factory horn, and disconnect the input wire, connect to the new horn system. It would have a speaker and control box with a switch inside to control several sounds. Probably cover the horn with a pillow or something to not annoy the neighbors while programming it!
Fred.