Having a matching pair of tools in a toolbox is a great idea, thanks for the advice!
Wait, didn't I just mention a toolbox?
What are you trying to accomplish? You want a tool that can pry heavily, punch holes in metal, and fit in your pocket?
You described 3 situations that were one-off cases and not something you encounter daily like a first-responder would.
-you needed to pry open your trunk but locked your prybar in said trunk...so what did you use?
-you needed to pry open a door which would surely ruin the door, so then why not just kick the door in? Again, what did you use in this situation?
-you tried to repair a stove MacGyver style and failed to do so because you didn't have a knife? So what did you do?
You claim you don't have access to your tools through the day, yet you don't bother to take tools with you and store them in an
accessible area of your car. That seems like a personal problem, and not something a tool will solve.
Sorry, I'm out of suggestions. As a construction worker that finds himself in many situations where a tool is
needed, I've never had the problems you've run into. I keep a tool box on my truck with anything from saws, hammers, prybars, etc and never found the need to replace them with a knife.
My suggestion still stands: toolbox... If that doesn't make sense, then sorry you can't find a way to prepare yourself for life's adventures.