Hi, no i did not test.I saw the last reply,stating "The thread is now closed until we have a new solution
Sam" and assumed there was no new solution yet 
Because you asked, I just had a look at a2dp-app-osmc and it seems it is mostly the same as my tutorial above, with the exception of using system-wide pulseaudio and an extra kodi addon so you can manage whatever is playing through Bluetooth on Kodi. If that works, it’s great and definitely an improvement on just being able to listen through the speakers !
EDIT: What I do differently in my tutorial is manually setting the default output device of PA to my Hifiberry. I didn’t see that happening in a2dp-app-osmc and thus I believe Pulseaudio could possibly choose the wrong audio output device. If this happens the user can fix this by following step 5 of the above tutorial.