I’m running a project for an alternative GUI for Roon. Under the hood it is using a framework developed by Google called Flutter. It allows app development for mobile, tablet and desktop and supports accessibility features. From its documentation:
Flutter is committed to supporting developers in making their apps more accessible, and includes first-class framework support for accessibility in addition to that provided by the underlying operating system
My project is very fresh, it hit the Roon Community last Friday, and I did not investigate the accessibility features yet, but this can surely be done in the future.
The problem for your use-case is that, although Flutter supports iOS and macOS, I’m not in the Apple ecosystem and therefor cannot provide the app for these platforms. Still wanted to let you know this exists, because maybe at some point an Apple developer within the Roon Community is willing to join the project, or maybe you have access to one of the platforms that I can support. These platforms being Linux, Android, Windows.