Well, dual class have to meet 4 criterea : human; sufficient stats in the leaving class; excellent stats in the new class; and L2 in the old class. BG adds another 3 : no ranger, paladin or bard MC; the target must make a valid multi-class; and only one new class. Only the first class can be a "Kit".
I'm not sure why your Kensai cannot be multiclassed. I put together a quick Human Kensai with 18/02 Str 14 Dex 11 Con 18 Int 9 Wiz & 8 Cha and was able to Dual-class to mage first thing.
Needless to say, I shan't be bothering to play this character through....
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