I've had my eye on this for a while, haven't dropped the dough on a PCB order

https://github.com/justLV/onju-voice

A hackable AI home assistant platform using the Google Nest Mini (2nd gen) form factor, consisting of:

a custom PCB designed to be a drop-in replacement to the original, using the ESP32-S3 for audio processing

a server for handling the transcription, response generation and Text-to-Speech from multiple devices on the same network