Rather aside from the deaf history piece - in terms of practical accommodations in Hogwarts - I would imagine that something like the 'Quick-Quotes Quill' spell could be done to transcribe the teachers words onto either paper, or a blackboard for the deaf student.
It wouldn't help with things like spell casting, but for things like potions, alchemy etc where verbalising isn't needed as much, it would be a relatively simple way for a student to at least know the theory content of the classes and give them a shot at keeping the grades to at least passing.

For the 'right' student they may be able to get a teacher to offer special tutoring in non-verbal magic - like Meserimus would probably tutor a kid he liked, or was in his hose --or they could learn that at the Flint Institute post Hogwarts.


It would be interesting to see someone working on something like a magical cochlear implant - the 19th century was obsessed with 'normalising' the body so it would be safe to assume there were attempts at magical interventions in hearing because there were definitely muggle attempts during the period, especially since oralism was the watch word of the day - ie learn through words or die trying and was adamantly opposed to sign language usage.

there was a big conference on deaf education in 1880, that was organised by a group opposed to sign language and the conferences 'conclusion' was that the oralist methodology should be used to educate the deaf and dumb. It was a shit show of a conference, hugely biased but was the basis of deaf education for years.