[RMMZ] FEW QUESTIONS BEFORE DECISIONS

So, I am interested in RPG maker MZ, but I am not sure if I dont wanna too much from this. So I have few question about what is possible - in basic MZ, with plugins that you know, or with plugins that you think would be possible to create).

• Team: I want active team limited to three actors, with another three available to swap in battle + series of other characters available to change with 6 party members (something like in pokemon series, but 3vs3 battles. Another difference from pokemon solution is that I dont need space for hundreds of actors ;)
  
  I know, that user can exp every actor or entire party at once. Is it possible to gain exp not for entire party but for entire class that we have active in party?
  
  Is it possible to change sprites and portraits to show equipment instead of anime style usual portrait/sprite
  
  I am thinking about Time progress battle system, but is there a way to make some skills active when time reach 33%/66%? To spam some attacks earlier?