Thank you all for your help.
We have a daughter & grandchild in Seattle, so we ended up asking DL to reroute us on day/evening flights LIH-HNL-SEA, avoiding a red-eye in uncomfortable seats, and then 2 days later a nonstop flight SEA-IND. We figured having one full day with family there was one way to make up for the inconvenience. The super-nice and helpful agent I talked to also got us each a $100 DL voucher toward a future flight.
So, as displeased as I am about the whole SNAFU, it has all worked out all right.
Thanks again!