Sometimes, the hardest thing is to find a group of like minded individuals to dive with, or who meet your needs/disability/mentality.
Might be worth making a list of organisations that people dive with and have experience of and also instructors who are used to adapting and also resorts/operators who are less able friendly?
I can recommend a few military ones I have experience of/with, hopefully might be of use to others, and hopefully others will add to this list?
First is BEWSA (British Ex Services Wheelchair Sports Association), they started diving in 2000, and are BSAC Branch 2000, great bunch, taught me to dive and do a bi annual diving exped, usually to the Red Sea.
Other group is BLESMA Divers (British Limbless Ex Service Mens Association), also a great bunch of idiots
Both these groups help Serving and Ex Serving to dive, and have no date restrictions on when the injuries occurred.
Hope this helps someone, and that the list grows