If the salary allows you to make such calculations, it is possible to receive correctly by half. But the fact that the value of bitcoin is very changeable, and today the price of one, tomorrow another, and the value of the salary to count each day, no one will.
Truth. It would be pointless to take half in fiat and half in bitcoin if your salary is low, because you would need to change bitcoins every single time for fiat, so that you would buy necessary things for day to day life. And yes it would be a bit hard to track value of bitcoin every time that they pay you. XD But it would be good for users maybe, because when bitcoin rise everyone is happy
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