I'm making my own Monk class and subclasses for fun with the following mechanical modifications:
Unarmored Defense (10 + Dex + Wis) will be replaced with Armored Defense with a magically bonded light armor (12 + Dex + 1/2 Wis) only while wearing it. Also, Unarmored Movement would only be usable while wearing the armor, not the other way around (and still thinking about reducing it a bit).
No shield or armor outside his own magic bonded armor, and no weapons proficiency. Just unarmed martial arts attacks. While wearing the armor, the monk would be able to add his proficiency bonus to the unarmed martial arts attacks damage.
The monk gains a number of extra Ki points equal to his proficiency bonus.
Would it be over-powered or gamebreaking to make half/-flavour half/-gameplay changes like these? (I'm not looking for feedback about flavor or personal tastes, just the balance question.)