The Hero 12 has timecode compatibility built in now without needing gopro labs firmware.
Timecode firmware site:
https://gopro.github.io/labs/control/precisiontime/
Buy the hero12 Here:
https://amzn.to/3EDHJT5
Filmed on:
A6700: https://amzn.to/44TEWQ8
Microphone:
https://amzn.to/45RrptT
Lens:
https://amzn.to/45Ubnza