I also worry about my wrists with doing boxing. Being that I also have tendonitis in both wrists it is a concern when it comes to my drumming. The last thing I want to do is mess up my wrists to where it would hurt my drumming career. But I do have a passion for self defense.
It would be awesome to have my career as a full time drummer and when I'm not on the road teach self defense (once I'm good enough to teach).