Render layers, glare with transparency

Render layers, nodes. I’m stuck and need to know a way to output transparent images with glare/gloom/glow (A). I can only make this work on top of another render layer.

On image (1) you see the effekt. On image (2) my attempt to process the beforementioned glow with no success. I have tried using this thread (using blur) but no success either. I can make to transparency but no glow. How do I achieve this?

Kindly, Mikael

Blender file with glare effect