Iberia is also a Chase UR transfer partner. If you can find MileSAAver seats on AA metal (not AS metal which can also show up on an aa.com award search) for a routing with a roundtrip mileage of under 8,000 flown miles, Iberia would charge just 42,000 Iberia Plus Avios for those seats.

Note, however, that there have been recent problems with booking AA award flights at Iberia's website, and all Iberia redemptions for AA flights are non-changeable/non-refundable. Whether it's worth it to you in order to save 30,000 UR points is something only you can decide.

Also, if you can find low-tier award seats for the roundtrip on UA flights, your best UR transfer option would probably be Singapore Airlines' KrisFlyer program, which charges just 35,000 miles for a Mainland-Hawaii roundtrip on UA.