Seriously, who needs to record someone without the knowledge of the person being recorded? That’s a big red flag, a perverted character, there’s no other explanation. Creepy Mark Zuckerberg allowed other creepy characters to share personal moments with him.
I’m not the person you’re replying to, but I’ve owned several pairs of bone conduction headphones, both Alibaba white label stuff and the big brand name. All of them:
They are essentially the “audio only version” of Meta glasses you’re requesting. My current Shokz OpenMove was a big upgrade in Bluetooth range and connection stability from any of the white label stuff, though some of those sounded about as good.