Unless you want to touch USB (WebUSB sometimes work, sometimes don't) or Bluetooth - Good luck on iOS where Apple is not supporting BLE interface on purpose, but on Windows and Android situation is not much better. Even ChromeOS can't run Web Bluetooth properly. Supported on paper, does not work anyway.
May I ask you to elaborate on what is not working for you with WebUSB and Web Bluetooth? I'm surprised to hear ChromeOS can't run Web Bluetooth properly.
