Sounds like (no pun intended) the real issue is that auditory processing just isn’t recognized as a disability, because having the same accommodations already existing for the deaf (transcripts, etc) would solve it.
I recommend the Google Pixel phone and the Recorder app. You don’t have to get a SIM card or even hook it up to WiFi. The Recorder app has an on-device ML model which translates speech to text, and will save it for later. It is probably the only offline tech capable of doing so because it uses Google Pixel’s unique neural network chips.
Now relying on this does mean that you’re still denied the chance to participate in real time, but it is what it is.