I'd look heavily for a direct exchange. Kauai is so much easier to get than Maui, especially through II and
DVC. The easiest resort to exchange to that's on the DVC list AND acceptable is the Kona Coast on the Island of HI. I would talk to San Francisco Exchange about the Embassy for Kaui, Pahio Shearwater, Hanalei Bay, Marriott and maybe the Intrawest property. I'd also consider Makai Club cottages, Lawaii Beach, Pahio at Bali Hai and the Pahio at Ka'Eo Kai. The later would be questionable exchanges using DVC because they're a trade down but still nice places to stay.
For Maui, I'd list the Whaler, Westin, Embassy, Marriott, One Napili and Sands of Kahana for the Lahiana area and for the South side, Maui Lea at Maui Hill. The trouble is that though many of these and a few others are pretty good properties, most if not all, are a trade down from DVC.
You might want to hit up a direct trade with an RCI member as it's many times easier to get a trade on demand with RCI than II. Also a RCI member can put a unit on hold and then ask if it's ok rather than being committed like with II.