If you cannot create an accessible page, provide a link to an alternative page that is accessible, has equivalent information (or functionality), and is updated as often as the inaccessible (original) page.
If after examining all the checkpoints, you find that compliance with the checklist cannot be achieved any other way, provide a link to another page, which is universally accessible and is built with technologies endorsed by the World Wide Web Consortium (W3C). This page should provide the same information or functionality as the inaccessible page but in an accessible format. Changes to content or functionality should be made to both pages simultaneously.
AccEase: Text-only websites: five key difficulties - Five key difficulties associated with text-only sites.
View WAI checkpoint 11.4 - If, after best efforts, you cannot create an accessible page, provide a link to an alternative page that uses W3C technologies, is accessible, has equivalent information (or functionality), and is updated as often as the inaccessible (original) page.