These responses are depressing. I know that they mean well, but I don't think your disability should stop you from enjoying the hobby or limit the size of your tank. As previous posters suggested you can automate the water change process. I also use canister filters, I have never had a nitrate problem and I remove and rinse the filters every week or two. Since the canister filters are under the stand they should be easier to access, but a sump is not more likely to overflow. I haven't switched to a sump bc I have a toddler and even if I locked the cabinet I would fear she would get into a sump, drop things in, pull things out, have a splash fest...you get the idea.
I am surprised no one has recommended looking for a reef club in your area. I know I would be happy to drop by a fellow reefer's house and do the lifting and such. I have had a tank maintenance company before do I have had it both ways. I prefer the joy that comes with caring for the tank myself, it makes enjoying it so much better. I keep my reef tanks for my autistic son so I modified the stand to be lower for him, that might help you with maintenance and feeding. There are shallower tanks to, but I don't think you HAVE to limit yourself to that. Depending on your space you could have a peninsula style tank that would give you access to both sides which might be helpful.
You may need to do things differently, but I think there is no reason you would be limited by your disability.