front drivers side airbag sensor

Need to replace front driver's side airbag sensor. It is secured by 2 screws, the top star screw easy to access but lower star screw access very difficult, poss half inch clearance due to radiator. Does anyone know easiest way to remove the sensor without having to dismantle the plastic radiator trim it is affixed to which would include removing the front bumper? Thanks in advance

Barring a right angle screwdriver, a 1/4" small box wrench and the appropriate hex drive Torx screwdriver bit should be able to get in there.