Look, I went to quite some lengths to access this Actually Good choice. You have to arrange to capture Eleanore after she has her hands on the Gauntlet, then deliberately time-out your dialogue choice to reveal the secret "I'm going to do... nothing" dialogue, and then that unlocks the hidden Actually Good option to Release Eleanore rather than Recruit or Kill.
It's an actual, meaningful sacrifice. This isn't a Bioware game - trying find the Actually Good options are hard and actually just weaken you. After all, for her to accept the Release rather than attack you, you need to give up the Dark God Gem as a proof of your bona fides - which makes developing your Workshop more expensive since it's the most efficient power source in the game, with only a small-medium risk of Baelogi and Athe escaping and forcing another boss fight.