I'm wondering if anyone is aware of a tool that could work as an internet connected dementia clock - that is displaying the time, time of day, date, and the ability to update the display remotely with reminders, notes, and messages.
I don't know of anything built for that purpose but you could use home assistant dashboards to pull it off pretty easily if you already have an instance set up.
I would prefer something that functions both on and off line. A home assistant dashboard will be useless while you, for example, reboot the server. You would want something that stores all it needs locally and gets pushes from a server. Though I don't know what that would be ..
As the importance of a system increases your attention to stability must also increase.
Edit: you probably want something that is locked down as well so that the user doesn't accidently click to a different screen or exit the app.