keychron k2: bluetooth always-on (opens in new tab)

Problem statement: the Keychron K2 (C3, stock firmware) disconnects from macOS after ~10 minutes idle — and there’s no way to prevent it. I spent some time looking for a fix. The usual suggestions: Disable Bluetooth auto-sleep in macOS? macOS doesn’t do that — the keyboard decides to sleep, not the host. Install a keep-alive app? The keyboard’s firmware powers down its own radio. By the time the app could send a ping, there’s nothing on the other end listening. Key combo to disable sleep on t...