The only thing I'd caution you against putting the horn on the right side is, virtually all bikes have the horn switch on the left. When you move that function, it can be unnatural to operate it when suddenly necessary. Just give that a think-through.
Personally, I basically never use my horn on a motorcycle. It is
my opinion that using a horn in a panic situation creates more likelihood of a crash (the driver suddenly brakes, right in your way) than it prevents. I tend to steer around the problem, or brake to avoid, then ride away muttering under my breath. The only time I use a horn in my vehicles is when someone begins entering my lane of traffic, from the side, and when I have no option to move out of harms way. With the sound-proffness of cars these days, it seems to take an 18-horn bugle brigade to even get anyones attention anymore.
As for your controls, as long as you can reach the essentials, put them where they can be reached. Or grow some man hands!