More Options

There are other choices besides them. Though some may have other issues than others.

1. Giganta: This is an interesting choice. While she is very strong physically, her size makes it a risk to put her in here. You'd need a way to control her size completely to keep her at normal size in the dungeon.

2. Circe: She is a risky choice, though great risk great reward. She won't be easy to convince to help you, due to how she is. Though her magic would be very helpful. You could possibly convince her to help with the offer of greater power and/or help with Wonder Woman.

3. Galatea: She is a clone of Supergirl, but far more mature in the physical department. She might be the easiest to convince to help you, as just a way to beat Supergirl should be enough to convince her.

4. Superwoman: This one, will likely require something else to convince. She's a member of the Crime Syndicate, an alternate version of the Justice League from Earth-3. Except they're all villains, since on Earth-3 the heroes and villains are swapped. She seemed most loyal to Owlman, who's dead now due to his failed attempt to destroy the multiverse. You don't know where to begin with convincing her, but she'd be a big help in your plans.