[jimmywanger]

What possible incentive could you give to the people in charge?

Nobody cares about making the prisoners' lives better - the ones that matter are felons who can't vote anyways.

Your value proposition is that you make the prisoners' lives better - how do you demonstrate value to the stakeholders?

More bluntly put, what's the value add to an elected official or a prison warden? I suppose if you did a study in prisons showing that your new device reduced violence and disturbances over the old typewriters, you might have a case.

Otherwise, you cannot convince the people who matter. This is not a tech problem, it's an institutional problem.