Moving the Darth Maul cold open to the end of S1 not only would be confusing from a timeline viewpoint, but also because the Nightsisters arc already ends with a pretty unambiguous Maul tease.
In fairness, even though I suggested putting Maul at the end of the season, that depends a lot on how Eddie redoes the Nightsisters arc. Personally, I feel like it would be interesting to cut Mother Talzin’s advice to Savage of “Go find your brother. His face is red” (maybe pushing that scene to the later “Return of Maul” episode). Instead, focus more on the Ventress side of things; then, at the end, after the Nightsisters are done, put in the Death Watch/Maul tease. Then, it would be, “Whoa, Death Watch is back! And Savage! So this is where he wound up after fleeing from Dooku! Wait, who’s that with him? Oh no, this can’t be good…”
But again, it all depends on what Eddie’s plans are for Nightsisters. Personally, I can’t wait to see it!