[Kputz]

What you may not realize is, many race cars are insured too. Mine is, and it's the ony way the thing is covered if it comes off the trailor during hauling, or is consumed in a garage fire. Check your homeowners insurance if you garage an unlicensed car, itmost likely isn't covered if consumed in a fire or collapse. It obviously isn't covered for on-track use, but it's the liability issue you want covered.
Give your agent a jingle and ask about a specialty binder. Different companies offer different binders, even for non competition use, which is what most "open track" events are. It might be pricey for just a day's outing, but then again, may pay to have the Porsche fixed. In any event, it's the liability issue you should be concerned with.
Fixing a car just isn't an issue with a race car, every builder realizes the day he finishes his car that he must be willing to push it off a cliff and walk away. Crashes are only an issue with "play racers" at open events.