I wouldn't describe myself as libertarian. To make a libertarian strawman, such a strawman might claim that all safety features in cars ought to be provided by the free market. Of course, the predictable outcome is that most people won't prioritize safety in cars, so cars that spend their production budget on non-safety features will outsell those that spend on safety features, leading to at best a niche market for safety cars.

So no, I don't think any libertarian is OK with being forced to do almost anything, in principle. The very idea that you'd need to wear seatbelts or have a license or be compelled to have insurance or not have an open bottle of vodka in your cup holder is anathema. The free market should simply operate through the courts and put those that can't drink responsibly and cover the damage they cause into debtors prisons, to continue the strawman.

I would actually prefer much stricter enforcement of insurance and licensing laws, akin to say, the UK or Germany. I don't think you need hardware interlocks to do it, but you would have to have police willing to actually pull over people with fake license plates or missing insurance. That is not the case in much of California.