Class info:

• Class name: Monk -> Adept
• Hit points at level 1: 10 + Constitution modifier
• Hit points on level up: 6 + Constitution modifier
• Skills with proficiency (Choose 2): Acrobatics, Athletics, History, Insight, Medicine, Perception, Religion, Stealth, Survival
  

• Ki Pool: Adept level + Wisdom modifier
• Martial Arts: Bonus Unarmed Strike - changed to a permanent bonus action attack that can be used at will while not wearing armour or shields.
• Unarmed Strike - just a regular one that can be used while holding a weapon, uses the Bonus one's animation.
• Unarmoured Defence, Flurry of Blows, Dextrous Attacks, Deft Strikes - unchanged
  

• Step of the Wind - now only gives one free Jump.
• Unarmoured Movement, Patient Defence - unchanged
  

• Ki Power x2 (scroll down for the list)
• Spirit of Tranquility (Charmed) - Togglable passive, removes the triggering conditions on toggle and on turn, if toggled on. 1 Ki per trigger.
• Subclass choice
  

• Feat choice
  

• Ki Power
• Spirit of Tranquility (Charmed, Diseased)
• Martial Arts: Evasive Attacks - Passive. Allows a free Unarmed Strike after using Patient Defence or Step of the Wind.
• Extra Attack - unchanged
  

• Unarmoured Movement II, Ki-Empowered Strikes - unchanged
  

• Ki Power
• Spirit of Tranquility (Charmed, Diseased, Frightened)
• Purity of Mind - Wisdom save proficiency. While you have at least 1 Ki left, you have Psychic damage resistance.
• Evasion - unchanged
  

• Feat choice
  

• Ki Power x2
• Spirit of Tranquility (Charmed, Diseased, Frightened, Poisoned)
  

• Purity of Body - Constitution save proficiency. While you have at least 1 Ki left, you have Poison damage resistance.
• Unarmoured Movement III - unchanged
  

• Ki Power
  

• Feat choice
  

• Deflect Missiles - vanilla
• Slow Fall - vanilla, check out 5e Monk for the better version.
• Spit Venom - Action, 1 Ki Point. Deal 2 Martial Arts die rolls poison damage to a
  target, inflict Blinded and Poisoned (no save) for 3 turns. Target can make Constitution saves to remove the effect at the end of its turn.
• Mystic Healing - Action, 1 Ki Point. Heal a creature for 2 Martial Arts die rolls + Wisdom modifier.
• Divine Light - Action. Choose a Cleric cantrip, can change it at long rest.
• Crane Style - Action. Enter a stance, gaining +1/-1 to AC/Attack rolls. Bonus and
  penalty increase by 1 for every 4 character levels after the 3rd. While in the stance, can use Crane Riposte - Reaction, unarmed strike against a melee opponent that misses. This attack deals a roll of Martial Arts die damage until character level 7, and only basic unarmed damage (no equipment/tavern brawler etc. bonuses) from level 7 to 11.
• Measured Offence - Passive. Patient Defence gives an additional reaction for that turn.
  

• Dragon Roar - Action, 2 Ki Points. Deal 2 Martial Arts die rolls psychic damage in a cone, possibly Frighten the targets. Already frightened targets become Fearful instead. Wisdom save.
• One-Inch Punch - Action, 1 Ki Point. Once per turn, deal Unarmed Strike damage and
  additional 3 Martial Arts die rolls  + Wisdom modifier force damage, push the target 6m back (no save). No Extra Attack interaction. Autocrits objects.
• Stunning Strike - vanilla, but only usable once per turn. Additionally Staggers (blocked reactions) the target with no save.
• Commune with Self - Action, 3 Ki Points. Gain proficiency in one of six sets of skills at a time, three skills in each.
• Enhance Ability - Action, 2 Ki Points. Vanilla spell, but only castable on self.
• Zen Archery - Action. Bind a bow to use Wisdom for attacks and damage, and replace
  the bow's damage die with your Martial Arts die. Additionally, can shoot Twin Arrows - Bonus Action, 1 Ki Point, 2 projectiles from a bow.
• Martial Arts: Careful Study - Passive. Gain Intelligence modifier to Insight and Perception, 1/2
  Intelligence modifier to initiative and AC, reduce crit threshold for weapon attacks by 1. The passive works only if you have at least 12 Intelligence.

• Sundering Blow - Interrupt, 1 Ki Point. Reduce a creature's AC by 2 for 10 turns on a melee hit. No save, no stacking.
• Seeking Strike - Interrupt, 1 Ki Point. Reroll a failed melee attack.
• Mystic Celerity - Action. Gain 3 turns of Haste for 2 Ki Points, or extend existing
  Haste duration to 3 turns for 1 Ki Point, if it is less than 3. Additionally, using Step of the Wind or Mystic Celerity gives Improved Critical (1) for the next attack.
• Enervating Blows - Passive. While you have at least 1 Ki left, dealing a melee crit inflicts Feeble for 3 turns, with no save to remove it.
• Mantle of Courtesy - Passive. Gain proficiency in Persuasion and use Wisdom instead of Charisma for the checks.
• Unburdened Martial Arts - Passive. Allows using different Adept features in light or medium
  armor: Bonus Unarmed Strike, Unarmoured Defence (1/2 of the bonus, rounded up), Unarmoured Movement (3m less speed), Feather Step (3m less jump distance).

• Ki Spellbane - Interrupt, Reaction, 2 Ki Points. Counterspell, but only autosucceeds
  against 1st and 0 level spells. 2nd level and higher spells require an Arcana check to recognise them first, check DC is 8 + 2*Spell Level.
• Feather Step - vanilla Advanced Unarmoured Movement.
• Ki Bending Sight - Passive. While you have at least 1 Ki left, you gain an additional half of your Proficiency Bonus to your Spell Save DC.
• Transcendent Suffering - Passive. While you have at least 1 Ki left, you gain damage reduction
  1 + 1 per every 20% of Max HP missing. Additionally, can use Mortification of the Soul - Bonus Action, once per short rest, restore 3 Ki Points, take 1/3 of Max HP necrotic damage.

• Diamond Soul - Interrupt, Reaction, 1 Ki Point. Reroll a failed saving throw.
• Whispers of the Wind - Action, 3 Ki Points. Strike up to five targets in a 9m radius,
  dealing weapon/unarmed damage. You can teleport to any of these targets immediately afterwards.
• Surge of Speed - Passive. While you are in combat and have at least 1 Ki left, dealing a
  crit or killing an enemy grants you an additional Bonus Action this round. Does not stack with other sources of additional bonus action points.