If you have not upgraded to debian stretch, it should work using this: [Deprecated] [TESTING] Bluetooth audio streaming (A2DP)
If you enable the jessie-devel repository, you must not do an update with MyOSMC or issue apt-get dist-upgrade since BT audio does not work with the latest (testing) debian.
Edit: What I mean is you should be able to issue sudo apt-get install a2dp-app-osmc and get some BT functionality without upgrading to stretch. If you are not in a hurry, wait for the next release of OSMC.