MEGAphone Bluetooth module

The next module on the list is something that can do BlueTooth to talk to a headset. For security reasons, I'd prefer something that is BlueTooth only, if I can find it. The problem is that the ESP32 is probably otherwise the obvious choice, but I'm not totally sure that it can be trusted. But then, there is lots of alternative firmware available for it, and at the end of the day, if you are using…