Jay,

I am not aware of the use of the dragon beam in vernacular styles in Switzerland. If it is used, it is probably found in cities, and there likely a French influence.
Hip roofs are framed with a very different method than that employing the dragon beam.
Jettying is not overly common, and when employed, the method of framing (Riegelbau/Fachwerk) does not necessitate the use of a diagonal beam.