Openlayers 3 - Clustering & Lines as a combination

My aim is to cluster many coordinates in the view. This points also can have "connections" between them which I want to show as a LineString.

I tried a lot but I cannot find a way to integrate the Lines into the Cluster.

My current (stable) status can be seen here: Fiddle

var clusterSource = new ol.source.Cluster({
  distance: 20,
  source: vectorDevices
});

If the two points "merge" into the cluster it would be great if the conntection disappears or is part of the cluster itself.

Can anyone help me?

I tried to add the vectorLine as a source to the Cluster fiddle

var clusterSource = new ol.source.Cluster({
  distance: 20,
  source: [vectorDevices, vectorLine]
});

or via addFeature fiddle

clusterSource.addFeature(vectorLine);