https://www.amazon.com/Aluminum-Pen-Shape-Stainless-Folding-...
https://www.amazon.com/Tableware-Camping-Tools-Portable-Mult...
I've heard it's not unusual in some places for people to do this with chopsticks.
https://www.amazon.com/Aluminum-Stainless-Folding-Chopsticks...
Maybe eat food that does not require cutlery ?
Part of reducing environmental damage is changing everyone's behaviour, and maybe considering eating in the car not being a good thing for several reasons, one of which is environmental impact.
Even if it was plastic: at least you'd get a chance to say no. Of all the single use food utensils handed over counters, a considerable fraction isn't even wanted by the customer and only accepted because denying would be extra effort for both sides.