If you're OO, I'd definitely use the DAL bennies to do NRT/ROR as plan A. If needed, UAL plus ID90 options on Korean/JAL (not sure what the OO agreements are presently) are all viable emergency exit routes. Avoiding HNL for unpredictable non-rev loads is probably sound advice. As with all non-rev travel, plan for the unexpected, but this one's definitely doable without buying tickets.