A wizard would have to respect the authority of the local elector count, even if doing so only to a certain extent, despite the fact that, ya know, elector counts are outside the colleges..
An advisor the elector count has appointed to deal with wizards carries the authority of said elector count.
Belegar is a king of a sovereign state, his authority within K8P is as big as any elector count, and the Dawi are allies of the empire.
Thus a person appointed by him to have authority over wizards has as much authority as Belegar does, and this takes primacy over any other status.
Similarly, should that person leave a temporary replacement, as long as Belegar does not object, said replacement carries the same influence.
Wizard rank has nothing to do with any of this, this power stems from political rank outside the colleges.
Sure but that would require Belegar to make a formal position of 'person in charge of wizards' and dwarfs do not change their laws on a scale of months. Panormia would have no formal authority, no informal clout, no legs to stand on.