org.freedesktop.DBus.Error.ServiceUnknown: The name org.bluez was not 
+provided by any .service files

I am curious why. maybe your bluetooth usb was not plugged in or turned on and the service did not auto-start. I have linux but it is without bluetooth and in my osx, well, i guess they have their own drivers.

Here are some other DIY ideas for unlocking your computer: face recognition, fingerprint recognition, voice recognition, whistle recognition, toe recognition (requires sandals but no socks). Of course security is big concern because someone with your phone or a picture of your iris or your finger can unlock. For this reason I propose to have a 2-level security. Unlock the screen with the proximity test only to reveal the usual login-box. This system is secure and also techie beyond cool. bw