Yes -- I'd seen that in the Wiki too ...but was sure I'd tried it sometime and found that the wisdom modifier still adds to AC.
But you're right -- what I'd tried is a monk wielding a weapon that wasn't a kama or unarmed, but still wearing a robe & no shield. When the class level restrictions came onto KT, I'd thought of changing my dex based fighter10/rogue2/WM28 to fighter10/monk2/WM28, as UMD was of no real use any more, and that 2 monk on a rapier wielding dexer would have been good for AC (wisdom), cleave, evasion & deflect arrows
So yes -- in this case the only AC bonus you'd get would be from Tumble
...and Paladins get Taunt as a class skill too