That reminds me that I have done it similarly. I had two rubber tourniquet straps with velcro on them which I used ot attach a light on a bicycle. Worked fine at the time, but later the rubber in the straps broke down so there went that option. Glad to hear there are other similar bicycle light mounts out there, I just mentioned the ones I knew of and had used. Your question posed by this thread reminded me of a YouTube video by EverydayTacticalVids called My Car Emergency Lights: Thrunite Catapult V6 & TC20 - A Thrower and A Flood Light. He made some good points; I think he may have also mentioned a headlamp, but don't recall for sure. I should add some flashlights to my car. I don't think the crank flashlight I have in there now holds a charge any longer. I would just utilize something I already have. I have not worried too much as I always have at least one EDC on me and if on a trip would have more. Something I don't mind risking if valet parking my car or having it serviced.