Thaaaaaat's GENIOUS! As long as the driver of the car doesn't show up while you're nabbing his air.
Typical car tires are at ~30-35 pounds, which is fine pressure for a desperate MTB or townie bike tire. Road bikes might need to find a nice big cargo truck of some sort- you might get 50-60 pounds out of them.
Two non-locking air chucks might be a better setup- you wouldn't need to flip/lock the two levers, and attaching/detaching your 'pump' in a hurry would be a non-issue. You'd just need some good hand strength.