Welcome to the world of being a senior with perceivable disabilities. One of the suggestions was to organize a class which is an excellent idea.
I am a NRA Instructor, 65 years old, and suffer from a severe spinal cord injury. It might be worth contacting the NRA to see if they can provide you with a list of senior (older) Instructors that can appreciate your disabilities. I think they will have more patience and understanding and could better relate to you. Not to say the younger guys couldn't... just a thought.
Like you, when I was a lot younger, I would kick butt and take names. If only I could do that today..... And, as you observed, you take the hand that is dealt to you as it sure beats the alternative.
May the Schwartz Be With You.