Or you could create a screen icon with Queen Beecon Widget. As I said before, the whole point of Bluetooth-PAN tethering is to tether at minimum power consumption. If you've to add extra layer of process just to make it running automatically, I'd rather recommend WiFi hotspot.

Thanks for your feedback. You might want to raise your question on dbus-script in a separate post for more help as the issue you've encountered seem to be a general dbus-script setup problem rather than issues on Bluetooth-PAN or tethering.