Dealt with something similar with my rgb bulbs in my bedroom. Flashed ESPHome on the bulbs and since they were on light switches I set them to come on as a shortcut. Need the light on and don’t have your phone? Just flip the switch off then back on. Have a power flicker or an outage you get bright lights from 7 rgb bulbs set to full blast. Wake up to burn your retinas bright light at random times of the night.

I use the bulbs as a wakeup sequence that shows weather via color and temperature as well. Then some others light up in order 25% every couple minutes. Then turn off after a certain amount of time. If I sleep through it I’m generally sick or that tired and need the extra rest, I use my phone’s alarm function for the have to be up and moving fallback.

Sorry. I’m just passing the information along. I would suggest contacting the Open Home Foundation. https://www.openhomefoundation.org/

For the money the Samsung A9+ is tough to beat IMHO.

11 inch touch screen in a slim package. Get a cheap jelly case run a couple screws into the wall, slip the tablet in place, route a charging cable.

No matter what you buy or build it will eventually be obsolete and need to be replaced. A decent tablet will last around 8 to 10 years as a wall mounted dashboard. The A9+ can be found for around 170 right now and the next prime sale will likely see it around 150. So that’s around 15 to 20 per year of use and all you need to do is either install the HomeAssistant app or setup Fully Kiosk.