Re: teaching the blind
I trained with a blind student a few years ago. When I met him, he was already an intermediate student, so I don't know how his early training went.
However, to help him understand my range at the start of a technique, I would call out "I'm about here" and clap my hands once or twice. This would give my opponent a rough idea where I was at.
He could do all the techniques of a normally sighted student. Just required a few extra minutes of practice.