Wouldn't a few mechanical devices attached to the airframe do that job? Something like the things you can attach to packages sent via UPS which tell if they have been mishandled. A simple spring balance which tore a piece of paper if stretched too far, something like that but obviously better thought out. Why would you hire a plane to somebody you think 'might have a go'? The way things are going now, one insurance claim could put you out of business.
That is incredibly geeky fiddlermax, people can be so ingenious.