I'm not sure if it's possible or permitted there (I've never been to any of the US national parks), but can you get a helicopter to do a dropoff/pickup? It's a common approach in ski fields and around glaciers, used frequently by skiers and photographers. If there are regular flight services in the area it'd be a couple hundred dollars - probably cheaper than the climbing and safety gear you'd need to walk there.
You could fly in in the afternoon, wait a couple hours for perfect light and fly out again at dusk, way later than it would be safe to do so if you needed to return on foot. And you get to bring much heavier/better gear without carrying it.
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