There used to be what we called 'Community engineers' years ago ..... they were trained to deal with people with various disabilities .... but like I say, this was years ago !!
I would imagine the ISP's will be the ones to 'own' the situation. I wonder if, as part of their plethora of scripted questions, whether disability crops up ?? I would like to think so.
I can say for certain that if the EU has requested that certain notes go on the task for when we pick the job up, then it usually happens.
For example .... there could be a certain private 'password' the EU want us to say before the EU opens the door, or the job notes will state to 'Knock VERY loudly and wait, as the EU is hard of hearing and struggles moving' .....
So I suppose to answer your question Ren ... yes, OR are very accommodating when we are made aware of special circumstances.