I believe @Iry said Two-Weapon Fighting, not Dual Wielder. With TWF:
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you must actually attack with a light melee weapon. Dual wielder removes the Light restriction, but you still have to have a weapon you are holding in each hand.
Anyway...
Remove TWF and you are good to go as you really don't need it. Dual Wielder does not require you to attack, just hold two weapons (one in each hand). So, as long as the weapons are drawn you get the +1 AC bonus. Use your action to Attack with an Unarmed Strike (gaining the +2 AC bonus because you are holding a kensei weapon (maybe two even LOL). Then use your bonus action for another attack via the monk and get your DEX modifier to damage.
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So, you get the +3 to AC and can make two unarmed strikes.
Now, your damage suffers a bit if you are making two unarmed strikes and not attacking with an actual weapon, but really IMO by the time your martial arts die is a d6, the difference is negligible.
The other reason for removing TWF is otherwise it doesn't work RAW. If you use the Attack action to attack with a kensei weapon (required for TWF) you can't replace the second weapon attack with an unarmed strike because then you are not making an attack with a weapon you are holding in your hand (again, required for TWF) because unarmed strikes do not count as weapons.
Since you can't then make an Unarmed Strike as part of the Attack action, no Agile Parry...
Of course, once you have Extra Attack, you can Attack with your Kensei weapon (gaining maybe 1 point of damage, shrug), make an Unarmed Strike via Extra Attack (Agile Parry triggers), make a bonus action attack with your other Kensei weapon (but no DEX mod to damage). Frankly, you are still better off using your bonus action for an unarmed strike via Martial Arts as you will get to add your DEX mod to damage.
So, just forget TWF really. You don't need it any it isn't helping you any.![]()
Not sure I follow, two weapon fighting doesn't really come into play. The bonus unarmed attack is a monk feature.
When you use the Attack action with an unarmed strike or a monk weapon on your turn, you can make one unarmed strike as a bonus action.
Since the short sword will be a monk weapon for the kensi, it all works. On the other hand, I'm still working on caffeinating so maybe I'm missing the pont. 