Having built the overlay and tested with orca I can confirm that this is broken by design for non-visual users of Ubuntu. You can't navigate to the overlay because it won't accept focus and only displays when the super key is held down, so using the orca modifier keys to attempt to navigate won't work. Is there a way the design can be modified such that screen reader users can access this information that is particularly valuable to these users?
Having built the overlay and tested with orca I can confirm that this is broken by design for non-visual users of Ubuntu. You can't navigate to the overlay because it won't accept focus and only displays when the super key is held down, so using the orca modifier keys to attempt to navigate won't work. Is there a way the design can be modified such that screen reader users can access this information that is particularly valuable to these users?