I'm looking for a text that treats category theory from the perspective of MK class theory.

MK is already very well-designed and equipped for the type of abstraction that occurs in category theory, and I suspect that this together with its ability to discuss proper classes with relative ease would make a treatment in that context very elegant and concise.

EDIT: It is also my understanding that many category theorists are less interested in viewing set theory as a foundation for mathematics, and more interested in it as simply a base language with which we can construct collections of objects in an intuitive manner and then manipulate them. It seems to me that a good option in this case is to simply pick an absurdly strong set theory to use as the underpinning 'language', and MK is more powerful than other widely studied set theories without the existence of inaccessible cardinals.