we use a spring-loaded center punch for windshields.
here is an example : Amazon.com
of course, some sort of knife is always “on” us….in a pocket, on a lanyard, etc.
here is a long story about a vehicle escape:
late at night, our dentist was driving back from a conference, came around a curve, and drove into a flooded part of the road.
he was in his Mercedes and it began to float, then started sinking. all electronics quit (shorted out?). his automatic seatbelt
would not retract. he happened to have dental tools with him which cut the belt. the doors would not unlock. the windows
would not roll down. he ended up kicking out the back windshield. it never broke or shattered. it popped out complete.
he got out ok, and his car only sank up to the door handles. now his escape tool is taped (not clipped) to his seatbelt.