Re: teaching the blind
I had a blind youth in my class for a while, and found it beneficial to focus on tai sabaki.
As for techniques, a few times I had the other students be blindfolded, and try to work through various basic techniques. It was enriching for us to try and 'feel' our way through (focusing on not losing contact with uke), rather than rely on how we normally 'see' ourselves doing a technique. It also increased empathy and allowed the students to connect on a different level.
Best of luck to both of you!