Why don't you just teach him to step his hindquarters over, if he moves his hindquarters away from you then you aren't likely to get kicked. You can do that on or off the line but it would probably be more clear to him to use a line when you start.

"It's really quite amazing what a horse will do for you, if he only understands what you want. 
And it it's also quite amazing what a horse will do to you if he doesn't." ~ Bill Dorrance