Hi,
the Debian derivative KNOPPIX comes with a boot option "adriane" that
may help you. An English page I found on
https://www.dedoimedo.com/computers/knoppix-adriane.html which is a bit
old (2009). The latest version with the Ariadne boot parameter is
described and downloadable on
http://www.knopper.net/knoppix/knoppix810.html .
The problem with Debian for supporting blind users is that most of its
developers are not (yet) visually impaired beyond wearing glasses. They
don't have the devices which are costly and even if they had then they
likely have nobody to test it. I have no immediate idea how to help that
situation.
Cheers,
Steffen