Hmm..ok
so there is an Arcanist, Divine and Martial base class
each class level they get 1-3 'artifice'from 4 types: General, Arcane, Divine or Martial.
Each artifice is either
passive (ie is an always on bonus) ,or
innate(in that it can be used each round), or
surge (in that it can be used once each encounter), or
adrenal (in that it can only be used once until a character rests/sleeps/meditates etc dependent on race and such)
these are heavily 'chained' so the
Martial Artifice: Surge: Charge (a move up two twice base rate ending with a +2 attack bonus) leads up to Over-run, Bull rush, Speed, Rush, etc. Martial Artifice
Arcane Artifce: Innate: Energyblast ( a ranged touch attack that does d6 damage at 'short range') leads to Energyblast II, Sickening blast, Fireblast, Ice blast, Stunning blast etc Arcane Artifice
at 6th level you can use two actions per round, at 11th you can use three....etc....so for example a level 7 martial character can use Martial Artifice: Surge: power attack and have a normal attack in one round.
There is no need for AOO. Just ensure you are using the General Artifce: innate: Ready Action and you can hit the next taregt that comes into your reach, fire an arrow at the next person to start spell use etc....
They are basically hundreds of different artifice and you build your own unqiue class that way?
Thoughts
John