Do any large companies use your library? If so, they likely have requirements to make their sites accessible. It may be worth finding out if they've modified your library in any way to make it accessible (or simply easier to make the end result accessible) and can submit the changes back. We're looking at doing that for a table library (slickgrid, e.g. [1]) we use, as we'd prefer to help an existing in-use library over doing more NIH work.

[1] https://github.com/6pac/SlickGrid/issues/37