Hello, everyone! My friend Twittered this post to me and I signed up to this forum, because I think I can help.
I am a teacher of the visually impaired (and, interestingly or perhaps not, went to law school in Madison WI in a previous career) and so I can hopefully give you some advice. (I am not visually impaired myself)
First, I understand the inclination to think this is too dangerous. For some folks, it may be--but hell, for some sighted folks it is too dangerous.
But with the proper guides and adaptations, many folks who are VI can do this.
Next, do you know if the folks are totally blind, low vision, Braille users...? If they need Braille markings on anything, I can help with that. If they are low vision, they may just require hand over hand techniques and guidance.
Also, keep in mind that most folks who are VI have figured out "life management skills"...that is, they have probably been taught or figured out a way to measure things, to not burn themselves at the stove and so on. Ask them what they do at home.
An easy modification is to use a "buddy system". My students are mainstreamed all day and I am always telling the mainstream teachers to use this system. I think it will work for brewing, as well. It's just what it sounds like...have someone work with the person who is VI, as part of a team.
I'm sure I will think of other stuff! Meantime, please let me know if you have any other thoughts/questions!
Patti