Michael O'Leary said:
we do not change our methods for individuals.
I know what you mean when you say that (Or at least I assume I know what you mean, in that the system and the standards do not change), but we can't forget, any instructor who's inflexible in their methods is going to be a very poor instructor.... we very well do change our methods for individuals.
Having taught on about a dozen BMQ courses now, there's always a couple of individuals who I question how they passed the aptitude test... BUT, with a bit of patience, and creative teaching methods, pretty much all of them eventually "get it". Sometimes it's repetition ad nauseum, sometimes it's just approaching it from a different angle with that one student.
The biggest limitation is not the required method but time... you've got to be able to learn "quick", in the time the forces allot. You only have so much time to learn, and the instructor only has so much time to teach you.
Honestly, I can't see any reason why a person with NLD wouldn't be able to pass BMQ, but I could see difficulty in some of the trades courses, and definitely in some of the more advanced courses... at the end of the day, the only ones who can tell you if you can be medically enrolled the medical folks at the recruiting centre.