I suspect nearly all of these touch the US because of the AA or AS flights nearly required for North America. I suppose you could fly into and out of Canada, but it's not the most straightforward OW itinerary. I don't believe you can fly directly into and out of Mexico on any OW airline without touching the US (on a OW RTW itinerary) NH flies to Mexico but JL does not. I guess someone might have booked into Mexico on IB or BA and out of Canada on JL or CX, but that's a huge ground segment that isn't cheap, I think most would have used AA or AS to get between.

Having said that the DOT hasn't been very helpful on other fares in the past. While this isn't an error fare, I wouldn't put much faith in them to enforce an QF fare rule on a routing change that has nothing to do with the US part of the itinerary.

Just as a point of reference from my limited experience with them, I once bought a ticket from Expeida.com on a 'package deal' with airfare and hotel. It was from TYO-BKK-TYO however with no component in the US except the actual website. This was when JL and PG were trying to form a partnership. Well apparently PG kept selling tickets on JL when JL was actually sold out. They tried to cancel my ticket, I refused, took it to the DOT since it was the American Expedia site and finally they negotiated. This was A LOT of back and forth but finally they put us on NH on their very last few seats (this was New Years week so everything was sold out ex-Japan). The DOT actually said they couldn't do anything directly since the flight didn't touch the US but since it was Expedia they'd help as much as they could, which was apparently a strongly worded letter that the airlines involved were not obliged to do anything about. It was finally a senior person in PG that was in contact with me and made the final arrangements on NH, Expedia never took any ownership.