No windmills here…
I wrote a HA addon that bundles X window system, Openbox window manager and Luakit browser to launch (and login to) HA dashboard.
It’s all very simple and lightweight – and at least on a RPi5, it doesn’t at all load down the system. And it’s quite fast since it doesn’t need to send data over your LAN.
It’s fully functioning though I continue to work on refining it so it is a work in progress.
See details in https://community.home-assistant.io/t/ha-kiosk-on-rpi5-running-haos/849371
As an aside, not sure why so many people have been “negative” about this use case – it seems perfectly natural and even obvious to me to have a display attached to the actual device running HAOS – even if just to check status. Plus, why spin up a whole new device when you can just access the display directly on the HAOS server.