Using a Raspberry Pi 4 with a 7" touchscreen display makes a perfect self-housed kiosk for HA. Unfortunately, HAOS has no support for this. I was able to get it working with Core, but Add-ons, etc is very limited. So I installed Supervised mode, adding over-complexity to what should be a simple install.
All that is needed is an Add-On that can install a container with a Chromium browser that self-boots to display the dashboard.
I have a couple of these. I just do the Raspberry Pi OS install and use the browser, run HA elsewhere.
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The idea is to make HA run on a Raspberry PI w/touchscreen to mimic a Google Nest or Amazon Alexa. – all in one unit.