Right, the focus on harness designs is irrelevant except for the lawyers at this point. The fix for this situation is simple. Ban tourist flights with people sitting in the door with legs dangling, so they need a harness at all. Give them a door-less flight while they're belted normally in their seats without a full harness, so quick egress is possible in the event of ditching or fire.
This entire situation is caused by the way they're offering to let people sit in the door frame during the flight. That just shouldn't be done unless someone has experience, and a proper harness and crew to monitor the situation (i.e. professional photo/film crew on assignment).