I would also consider whether it might be worthwhile changing to a flight to HNL the evening before, pick up a $150 room at the Airport Ohana Hotel, and then simply get shuttled by the hotel shuttle bus to check-in the following morning.

Yes, there are better hotels in Honolulu, but the recently remodeled Airport Ohana Hotel is made to order for this kind of situation, imo.

I don't know what the 24 hour clock is on your rental, but you might offset part of the cost by a shorter rental car time while on Maui.

In fact, if you decide on this route, I have a $50 hotelclub.com credit I'd be happy to pass along to you.