I've developed a open hardware 3d printable LCD touchscreen which uses WiFi+MQTT to interact with Home Assistant which fits into a standard wall panel which you

I've developed a open hardware 3d printable LCD touchscreen which uses WiFi+MQTT to interact with Home Assistant which fits into a standard wall panel which you can find here: https://github.com/aderusha/HASwitchPlate https://github.com/aderusha/HASwitchPlate This still requires Home Assistant to be running somewhere else on the network and uses an ESP8266 instead of a Pi for several reasons, but it might help you out on your use case.