Dropping into Loki's is fine, I'm pretty up to date on most things with him, I think, and it's a lot more exciting to put them into since Steven is kind of trying to pretend things are normal, I think, near the end of his own. They do, technically, exist in the same universe though, Moon Knight is just set 2024(2025?) ish, so after the events of like everything happened.

Setting it between IW and Endgame works for me, I think redemption arcs are grand and does give us something to work for with the both of them.