This 12k business, is factually incorrect.No dear... air strikes are not carried out in swords and horse style.
Advantage without doubt lies with the strike package and most likely carried out at night. They will deliver the package, before Iranian SAM batteries are awoken, while i expect the escorts blinding all Iranian defenses and rendering all communications ineffective, Infect all sources of electronic activity would be targeted within span of seconds, unless pilot is waiting for political approvals as in case of Pakistan India air battle 27th February. Homing on target is job of the weapon, pilot is free to climb at safer altitude.
Evasive measures will surely be necessity, if all ECM fail, which is based on world's most advance technology available today.
I'm not an expert but can't confirm your 12K figure, but do explain why it is required?
Please as well tell, what actually are Iranian defense batteries, which can launch barrage of missiles at each F-16 flying at 12K altitude!