@ldubost From a very quick initial look, the rich text option does seem more promising, but quite a lot of the accessibility help is rendered inaccurate by bugs within the components.
For example, the Alt+0 dialog indicates that I can use the arrow keys to navigate editor toolbars and the context menu, but in both cases the arrow keys don't do anything. In the toolbars, the only option is inefficient tabbing, while I can't work out how to navigate the editor context menu at all.
Unfortunately I don't have time to test more today. @cryptpad