I found a website, whilst researching to build our own, called exceptionalindividuals.com. On this website they had a widget at the bottom of the screen that had controls to alter the way the website was displayed. It even had a play/pause/stop control that would read out any highlighted text for those with difficulty in reading or with visual impairments.
The widget had toggle buttons for high contrast viewing (dyslexia/colour-blindness etc.) and also buttons that altered the size of the text on the page.
Do you have any resources like this that can be added to a website that is created on your platform? If not, please can you develop one?