That skill in being sensitive, adaptive and successful with atypical learners is an important one. Well done you Beardy for having compassion, understanding and effectiveness at helping your son overcome barriers and clearly improve confidence to pass his test (at a REALLY tricky time). If this is a thing you wanted to do, I reckon it'd be an interesting later-life career.
I swear 50% of driving instructors are shysters. My 1st one advertised his firm as disability-specialists and was a hideous disablist macho creep who drove aggressively, jumped out of the car at the start of one of my lessons to threaten one of my college peers who he perceived as "driving too close to his car" and ditched me after 4 lessons (thankfully) having taught me nothing and told me it was all my fault for being too disabled... (But not in the actual ways that I am too disabled to drive safely). I know someone who shouldn't legally be driving (who didn't get told this) whose driving instructor took their money for THREE years before suggesting a 2nd opinion who immediately spotted the issue and told person they weren't safe to drive.