There might be legal issues or insurance issues if you tamper with the air bag. Ive just heard this, never actually seen it though. If you were in a crash (hopefully not), and you were hurt becuase suposedly the air bag would have help, then you might not be covered.
I have a Grant on my 89 with no factory air bag. I love it. Feels like Im driving a sports car with that small a wheel. And its nice not having to turn the huge bus wheel. I didnt hook up the horn becuase I didnt understand how. If anyone knows of a write up on how to do this, let me know.