You project seems extraordinary and it would be an honor to implement it.
I would like to note that a project like this needs a lot of time to get right given the people that is meant to.
I saw some main obstacles in developement
- Information transmission towards the users
- As a solution for this issue i propose a combination between sound notifications and carefully synchronized vibrations coded into, for instance, Braille, or some other way that will make the user sense the amount of time remaining
- Getting input information from the user
- As a solution for this issue i propose a UI interface with very big interaction areas, like entire screen for starting and stoping the clock, and speech recognition using Google Cloud Speech-to-Text API.
I find the project extremely interesting and with a noble cause and, like i said in the first part, it would be a great honor to build it.
Thank you,
Cosmin