Hello,
So apparently, Orca sucks on Wayland. I am not a Orca user, nor visually impaired, but this has been a pain point on KDE too, I believe.
The author of AccessKit, which is used in GNOME and Cosmic, has started working on a project called Newton :
This is early work, but do you think it could also be integrated to KDE Plasma to have a common accessibility platform?