Based on your experience and existing code, it is easy to add continuous listening? Have not tested it but probably is already there. For example, I would like to have it always turned on and speaking to it about ideas at random times.
HomeAssistant seems to natively support wake words, but I haven't looked into it yet. I simply use my smartwatch (Wear OS supports replacing Google Assistant with HomeAssistant's Assist functionality) to interact with the LLM
The cam is positioned higher than most things in the room to reduce triggering it unnecessarily.
When it triggers (currently using just simple cvv facial landmark detection) it emits a beep and then listens for a verbal command.