Yeah, very difficult isn't it. Over-learning is sometimes the only option for people who find spatial stuff difficult. Or have other types of learning difference. There are strategies you can do obviously, but practice practice practice is also huge.
And yeah, it wouldn't be an easy career change, not least trying to show yourself as not like the shysters and building up a customer base via trust and teaching yourself about broader disability stuff on top of learning to drive-instruct.
But you could do it, especially if you got yourself some proper Disability Equality Training by actual proper politically disabled people with the relevant impairments so learned more about a range of needs and approaches.