I have transported my guitar by bike and used a soft backpack style case. I, too, worried about destroying the guitar should I get into an accident. What about taking your good case (probably heavy) to the guitar shop and see if it fits inside of one of those nylon gig cases. They are comfortable and I'll bet you can find one that fits around your safe(r) case.

By the way. DrCycleMrDrive, I noticed we both have the same avatar and Dr in our forum ID. Interesting coincidence. I got the nickname Dr. FeelGood at family and friend gatherings and I admire Einstein. What's your story?