I might have found a martial arts technique that seems to have good chances of working even if you are totally blind.
Wing Chun promotes two principles which do indeed read and sound like it might be exactly what a blind person wants to practice: Close range and uncommitted techniques. I can't really tell you more just now except what you can already read on the Internet. Just one more very relevant pointer: Chi sao (sticking hands). The idea is to develop reflexes especially for close range combat, and the principle is to always stay in contact with your opponent, something that very much resonates with me (obviously, keeping in touch with your opponent is exactly what you need if you have no sight at all).