What about a marketplace for a solution to these problems? If I build a website I can't tell how disabled friendly it is, the best I can do is follow practises

What about a marketplace for a solution to these problems? If I build a website I can't tell how disabled friendly it is, the best I can do is follow practises I find on some accessibility blog and maybe test it in a screenreader. It would be a value add service to have a disabled person test their use of my site for various tasks and give me honest feedback.