Again, "no contents beyond whatever normally comes as safety equipment" means no tools, so whatever you can lever off or smash with the tire iron is about it. EDC isn't part of the exercise.
Bummer. I was just waiting for the ETS forum crowd to jump in with their somewhat more extensive definition of "standard safety equipment".
Without ANY tools beyond the equipment supplied by the car dealer you probably won't even have a knife. Breaking some glass is probably the easiest way to get a sharp edge.
Does "safety equipment" include first aid kit? It does in some countries. If so, scissors and tape may be included in the first aid kit. Wrap tape around the glas splint to create a more comfortable handle to your glas knife.
The 1st aid scissors - IF you have them - are probably more useful for cutting through fabric (seat belts, upholstery) than your glas knife.
In Europe, standard safety equipment includes bright neon yellow reflective safety west and a red safety triangle. At least take the west and think really careful if you should take the triangle, too.
Removing the washer fluid tubing is a good idea. Just rinse them with plenty of water and you should be fine with them for water tubing. They also have plenty of other uses. Your
"standard safety equipment" may or may not include enough tools to dismantle the fluid tank without breaking it.
Beyond that - listen to Dweste and STOP. What is the situation? What are your most immediate concerns? (The rules of 3 is a good indicator here). If you can meet those most immediate needs (i.e. won't freeze to death/die of thirst/heat stroke), what are your options? (Self extract/wait for rescue/wait for improvement of conditions). You should weight your options really careful before you render your vehicle inoperable.
Beyond the washer fluid tubing (don't forget the headligth washers if you have them!), the
safety equipment, the tires, the seat belts and whatever fabric you can get from the seats / upholstery and the wipers, there is very little you can do with minimum tools.