Hi Milt - I called the Strassenverkehrsamt in Zurich a few weeks ago for the very same reason. It was (verbally) confirmed to me that the "B" (for cars) is sufficient.
Further, a foreign driving license may only be used in Switzerland for a maximum duration of 12 months. After this "grace period" the license may no longer be used! During these 12 months, the switch is super easy and a formality without an actual driving test (if it is a license issued by a EU/EFTA state). As this period expired, I can't confirm what the procedure is, but I think one could argue that he was studying, had no car and hence missing the deadline is forgivable...
