Another idea to bring in non armored villains like Blizzard, Whirlwind, Firebrand and Earthmover is to go the dtv Invincible Iron Man movie route. Have Mandarin control them, call them the Elementals
and update them to kinda look like this.
Or just have Hammer get out of jail, seek revenge on Pepper and use them.
Though having too many villains usually always ruins a movie, so just use two of them or so.