There are several Way of the Kensei Monk subclass mods on Nexus - I have not tried them, and none are 5e RAW representations, so here you go. Acknowledgements for everyone who made this subclass for BG3 before me,
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File credits
drkekyl khn functions, Diz SE code
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***Before updating - respec into something else | save | exit | update this mod | respec back t0 Kensei***
All script extender functionality converted to Osiris (credit Celes for the work on this)
Fix kensei weapons damage scaling not reverting to normal after respec
Fix Greatclubs not using Dex when it is higher than Strength
Refresh subclass icons
Data cleanup
Version 1.9.0.8
Fix for SE console errors (last time)
Version 1.9.0.7
Fix for SE console errors (take 2)
Version 1.9.0.6
Fix for SE console errors (take 2)
Version 1.9.0.5
Fix for SE console errors
Version 1.9.0.4
Move the Unarmed/Weapon Attack toggle to Kensei level 3 exclusively, and removed the CF integration for that ability
Version 1.9.0.3
Fix functions
Version 1.9.0.2
Added a toggle that will allow you to use unarmed attacks while holding a melee weapon [NOTE: This WILL be added to all Monks at Level 1. You will likely need to RESPEC]
Removed the standalone unarmed attack spell that was there to allow you to Agile Parry properly - use the toggle now
Version 1.9.0.1
Fix issue where Off Hand Active status would clear on its own
Version 1.9.0
Patch 7 Comptaible - Update Improved UI, continue to use Compatibility Framework + Community Library
Version 1.0.1
Fix longbows missing from monk weapon override SE code
Fix scrolling SE console errors some folks were seeing
Version 1.0.0
Initial release
This mod officially supports progression to Level 20 with Expansion. Other mods that remove level cap will likely work, but I have not tested them.
For the best tabletop Monk experience in BG3 I highly suggest you also use one of the 5e Monk Adjustment mods: Monk 5e Adjustments or 5eE Monk Rework.
At Level 3, this mod adds a toggle for the Kensei that allows them to make unarmed attacks while holding a melee weapon, without having it be a separate spell. Toggle on = attack with and use animations of unarmed attacks when you make a melee attack | Toggle off = normal attack with weapon behavior.
IMPLEMENTATION:Kensei Weapons is Rules as Written. I included Darts and Slings since they were in the data files, but they don't actually exist in the base game (maybe through other mods or sometime in the future). If you want Monk Damage Dice to scale with any of the two-handed options in the list (i.e. shortbows), you MUST use Script Extender.Agile Parry is Rules as Written. Kensei's Shot is Rules as Written. You will not see the damage bonus on the weapon tooltip, but it will show in the combat log. Way of the Brush has no purpose in BG3, so instead you gain proficiency in Performance. You must use Improved UI to be able to see the skill selection on Level Up (other CC UI mods may conflict and break it).
IMPLEMENTATION:Magic Kensei Weapons is Rules as Written. Deft Strike is Rules as Written - implemented as a toggle so it can stack with interrupts like Sneak Attack. The first attack you land while the toggle is on will gain Deft Strike... turn it off/on strategically as needed. You will not see the damage bonus on the weapon tooltip, but it will show in the combat log.
IMPLEMENTATION: Rules as Written. Sharpen the Blade will target the weapon in your active weapon set and the hand indicated by the toggle on your hotbar (i.e. if you want to Sharpen your offhand dagger, make sure your melee set is active, and turn the hotbar toggle to Off Hand, then cast). You will not see the damage bonus on the weapon tooltip, but it will show in the combat log.
IMPLEMENTATION: Rules as Written, but I couldn't restrict Thrown weapons exactly the way it should be due to some game limitations with Interrupts and Throw spells - it will still work though.
SPECIAL THANKS AND CREDITS: Thank you to DiZ91891 for the SE solution for twohanded weapons and scaling monk damage, and to drkekyll for their amazing 5eE Monk Rework version of Kensei that helped me figure several things out with this subclass.