Legislation plays an important role in making sure that employers have accommodation policies in place and they follow them through. In Ontario we have the Accessibility for Ontarians with Disabilities Act, and that is...the employment standards are trying to take away that practice....
But I agree with Alex that those work experiences are very important. Even when I said to attach disability services to individuals, they should not be stopped by just saying their place of residence, because those support services could be given at the place of work.
Also, if youth are managing their own services, I can tell you from experience that you develop skills because you are employers of your own services and you are managing your own services. The coping skills, the negotiating skills, and the purchasing skills that you develop are invaluable softer skills that will allow you to become more self-sufficient in negotiating with employers on accommodation.
Then, if it is needed that you have to file a human rights complaint in Ontario, go for it, but before that, there are a lot of steps. WIth respect to self-confidence in youth and in others, you can bring it about through some of the programs and initiatives we have highlighted.