I have tried reading this font, and had a lot of trouble although not dyslexic. What I gather from your posts is that greatest importance is having a font with letters highly distinguishable from one another (so they don't become misinterpreted). As an idea, a set of random dots can be added around each letter. As the person encounters the same letters while reading, they would encounter the same set of random dots for those letters. I am not sure if this would work, but it can be done and tested.