A lot of the change necessary is not going to happen until more people file EEO complaints, law suits and any other kind of complaint applicable. Even though the EEO process hardly works, it's one of the few avenues of redress.
I know that people are afraid of retaliation, which does happen. But, Federal agencies don't like EEO complaints and they don't like bad publicity. Take it to your elected officials. But, whatever you do, don't tolerate discriminatory acts such as inaccessible IT. On some level, it really is that straight-forward.