Carpet bombing would be a waste of munitions. Iran to your point is massive and surface level bombing would mostly take out civilians. The civilians have been through enough. Most of Irans military and religious leaders are in missile cities that are 500 meters+ under mountains of rock, the same places they are creating nuclear material. These bunkers are immune to bunker busters and nukes. That will require ground troops and likely a lot of them. How that plays out specifically I have not a clue. I can only hope that they share body-cam footage and that casualties are kept to a minimum. If there is one thing I can give Iran credit for that is building some amazing and very impressive bunkers using US dollars.

with heavy concessions to Iran to prevent them from racing to a bomb

This game has already been played out many times before. Obama unfroze 1.7 billion, Biden gave them upwards of 6 billion. All together the US has given them upwards of 60 billion to pinky promise they wont build nukes. Never pay a bully, ever. They used that extortion money to build bunkers, pay their proxy soldiers to attack Israel and all the gulf states and to work on their bunkers. There will be no more of that. Shame on anyone that falls for those shenanigans again.