Workaround for associating <Placemark>s of KML, KMZ or CZML files with .gltf models?

So I know that officially <Model> support is currently not finished with KML files:

Is there any way I could convert KML to CZML so I can have my .gltf model show up? It should already be possible because manually adding the gltf model works (with viewer.entities.add ... ).

For example already seem to have it working dynamically - at least they have <Model> references in their data and they are using Cesium.

Have a look at my test app that converts kml models from a kml document, to czml models at:

It maybe of use for offline batch processing.