Someone actually wrote it, sorta, ages ago (try the Helen Cobb tag on AO3), and I've been meaning to do something with it ever since. I read a couple books about the Mercury 13 project and women fliers in that period, but haven't landed on a plot yet.

I'm not sure Peggy could get Helen into SHIELD full time, I feel like she's be more of a free agent who came in an rained chaos and gave Edwin and Howard nightmares a couple times a year.

Thanks for the great comment :D