I was directed from [MagicMirror Forum] Digest for 1/11/2026 to that discussion and I can show you some kind of alternative regarding Home Assistant controlled MagicMirror. It is using TouchKIO as a mirror client.
Recently I did upgrade my many years existing setup and I did summarize it here:
https://github.com/Lateadapter/TouchKIO-as-Kiosk-Application-for-MagicMirror