Black Widow, Scarlet Witch, Wasp, Valkyrie, Shuri, Captain Marvel
I would be so, SO here for this. Throw Gamora in there too for good measure, or maybe Mantis. Put them up against Taskmaster and Count Nefaria and watch the good times roll.
A-Force is a horrible name though. Liberators would probably be a better move, or even better: Champions.
Marvel has done a pretty good job making sure female characters are not just helpless and there to be saved. Widow, Hope, Sif, Gamora, etc are never shown to be in any more danger than that of their male counterparts. And in many cases actually save the hero.
While they haven't been as useless as female leads in other action franchises, the MCU's females are still more likely to get damseled than the male heroes. Because I have some spare time, I'd like to review these instances, and see what you and others thing:
Widow in initially outwits by pretending to be a damsel in Iron Man 2 and Avengers. In Avengers is the only person in danger of being killed by Hulk, which is her major action sequence outside of defeating Hawkeye, and also finds herself protected by Cap's shield when they blow up that first leviathan. She does not save anyone from death, the way Thor, and Cap save her. In Winter Soldier, Cap not only saves her from the grenade on the boat, but from Winter Soldier near the middle, and then it is her possible death that Pierce holds hostage over Fury, not a male character's or the other way around. Widow does however save Cap and Sam in the car from Winter Soldier, though it is very subtle and quick, it was super cool.
In Avengers 2 it is Widow who is the captured damsel that Hulk rescues, not a male character. Interestingly in Cap 3, it is a female, Scarlet Witch who takes her out in the airport fight, and not the male whose protection is part of her origin story, Hawkeye. Widow is absolutely more of a damsel than the rest of the Avengers, and rarely saves them, though they are always saving her.
Gamora is just as bad, with her intro to the team being saved from Drax by Quill, and then being saved from space by Quill, and then joining with everyone in saving Quill, while he's also saving everyone, to defeat Ronan. In Guardians 2, they largely remove her from combat outside of Nebula towards the end and the monster at the beginning.
Sif and Hope are supporting characters who, despite their significant experience, aren't actually very helpful when it comes down to the saving, and get saved just like the rest of the world/universe, and do nothing to save the lives of the male heroes in the meantime. They simply are unnecessary utility packaged in eye candy.
And those are just the characters who, logically speaking, should be just as competent in combat and saving as the male heroes they are around. This extends to Elektra, Colleen Wing, and Misty Knight. This is to say nothing about Jane Foster or Christine Palmer. Never you mind. The actual standouts are Pepper Potts who saves Tony twice in Iron Man, whereas he only saves her once, and then actually is the 'hero' who defeats the villain in Iron Man 3. Also you've got Peggy Carter who doesn't ever get saved, but actually comes to Steve's rescue near the end of The First Avenger.
Keeping in mind that male characters do not have this dynamic. Many male supporting characters seem to help save the hero, but never need saving themselves. Some do, like Rhodey in Iron Man 2, but these are the exceptions. It's not about just being support characters it's about how women are conceived, because even though MCU is doing better than most by actually having female heroes that are cool and interesting, the MCU is still a universe that is illogically dominated by men, because that's what the source material had. In a more "realistic" world, about half of the Avengers would be women. About half of the Defenders. About half of the Guardians of the Galaxy.