Wake word is not expensive, you can do it on esp32 https://docs.espressif.com/projects/esp-sr/en/latest/esp32s3/wake_word_engine/README.html https://docs.espres

Wake word is not expensive, you can do it on esp32 https://docs.espressif.com/projects/esp-sr/en/latest/esp32s3/wake_word_engine/README.html https://docs.espressif.com/projects/esp-sr/en/latest/esp32s3... (and then send audio to something more beefy as TTS will be marginal at best).