It was 8 years before FFXI got more accessable for me, so I wouldn't get your hopes up for XIV. We're just not a large enough portion of the market to justify the cost I suppose.

My issue is a visual impairment, which is actually much better addressed in XIV. I'm guessing from your post your issues are more of a physical mobility problem. I'm not sure if it'll be any help, but have you looked into the keybind configurations? They seem to offer some solutions depending on your impairment. Either way I'm sure we'll get by like we always do until things change. Exceeding your limitations is a part of being physically impaired.