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I see three possible issues with your wiring diagram.
First and not critical the horn button in the ca is to ground not hot.
Second your added switch connects the alternate sided of the added relay and there is no ground so the relay will do nothing when the switch is pressed.
The next thing is that the switch you added is momentary and even if wired correctly would require pushing both the horn relay and your switch.
If you install a single pole double through switch on the output of the of the stock horn relay you could select either the oem horn or the control terminal of the new single pole relay. I believe you were trying to use an alternate power supply so you do not burn out the horn fuse, power from the cig lighter or better yet directly from the battery through a fuse to the new relay.
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