Possible Penelope Warrior AUs
(I haven't read The Odyssey or anything to do with Homer!Odysseus. All my thoughts and characters are inspired by the epic musical.)
I love the idea of the Penelope Warrior AU, but it's very hard to think of a viable reason Penelope would take Odysseus's place in such a patriarchal time.
One idea is that if Odysseus is severely maimed by Athena's boar, and while he remains her champion, he's significantly disabled with a severe limp. Fearing Odysseus will be killed because of his obvious weakness, Penelope takes his place, Mulan style.
Another is if Odysseus is very badly injured early on in the Trojan War and is sent home to recover. Of course, someone still needs to help with the war in his place and with Telemachus still a baby, it's up to Penelope to take her husband's place and help save Helen.
An idea I had is similar to the second idea. During Palamedes' visit something happens while saving Telemachus from the plough that causes Odysseus to almost lose his left arm. Now this is really bad, for one, Odysseus is really badly hurt. Too hurt to make the trip to Troy, especially if he wants to keep his arm. The other problem is that Odysseus is left-handed. Palamedes not only almost killed Telemachus, he now also crippled the person he was meant to bring to war.
Realising he's now got to do something and fast, Palamedes remembers that Penelope is a previous princess of Sparta. He threatens her that if she doesn't come to Troy with him, then he will drag Odysseus there, injury or not.
Seeing no other option, Penelope agrees to go to Troy, leaving Odysseus home to recover and raise Telemachus. Seeing no other option, Odysseus begs Penelope to go to the temple and pray for a god to sponsor her, like Athena sponsors him.
Penelope agrees, expecting Athena to answer her call, but instead Ares answers. He says that he will see Penelope through the wa,r but she must follow everything he says and awaken the visiousness she suppressed to become who she is now.