EDIT: The real question is, why would you want to? It gives Charisma-based casting (generating MAD), a crude method of negating the regular penalty associated with spontaneous casting and metamagic, etc.
Two words: Ultimate Magus.
Wiz5/KotW1/UM10/XXX4
KotW casting level rules mean you never have to worry about losing wizard levels cause your KotW CL is always one higher, 8th level on the KotW progression gets you 6th level spells so you can start throwing persistent stuff about. You don't care about Cha because you never need the KotW DCs. Needing charisma 16 by 16th isn't an enormous handicap.
So you get 19th level wizard spell progression to go with 0,4,4,3,3,2,2 spells from KotW. Compared to 6,6,6,5,3,0,0 from an equivalent sorceror dip. Also you have slightly better saves and HP than your sorceror buddy.