This is going to be a little complicated but here it is.
On your Kensi Weapon add the advanced effect
You'll need to make a Weapon for your unarmed strike so you can attach an advanced effect to it. Once you do attach the following and set it to action only
Code:
IF CUSTOM(Kensi); ATKADD: KensiAdd
Then finally you'll need the custom effect in your effect list. You can get rid of the IFTN if you aren't using untrue effects
Code:
KensiAdd; TURNRS; IFN: Incapacitated; AC: 2 melee
Seems to be working for me but I want to do some more testing with the other changes and then this should all work next update.