1. You need not accept the proposed reroute. If you are willing to wait out the 7-hour delay, just ask to be rebooked onto DL and be done with it.
2. While DL can easily "see" that you are double-booking if the reroute is within ST, DL has no visibility into *A. Just make your ORC request to DL and then a *A request once DL has credited to DL. But, do understand that *A awards on the fare basis paid, not booked. Thus, almost all reroutes onto UA show as Y, but won't credit as Y.
3. You can't force DL to book into E+, but you can ask. You may well find that the seat assignment won't stick and you wind up in whatever is left at the gate.
4. Alternatively take a look at other HNL-SFO routings and check to see if any are cheaper than what you paid DL. It's not likely, but it happens. If you find something cheaper, simply ask DL for a refund of the HNL-SFO and purchase what you want.
5. While all three alliances require interline ticketing agreements within the alliance, interline agreements have nothing directly to do with alliances. DL can rebook onto any carrier with an interline agreement. Largely, this means only no AA (on the HNL hop).