Your synopsis is much closer to how I always imagined the Prequels than what we actually got. The prominence of Alderaan in the narrative, Anakin’s love interest as an Alderaanian princess/aristocrat, the main villain getting killed by Anakin at the end of Episode 2 and acting as a catalyst for Anakin’s fall… all of that is what I imagined the Prequels would be, and arguably, is much closer to what was implicitly suggested by the tidbits of backstory mentioned in the OT.
Lady Nellith Arcadia is a member of the Alderaanian aristocracy, she is a compassionate, altruistic, and idealistic young woman, an individual with the heart of a true Jedi. She wanted to help others and was extremely empathetic. She was originally supposed to marry Antilles Organa, but the wedding was canceled as she fell in love with the young Anakin. During the War Nellith joined the Republic forces to protect those in need. Her parents eventually allowed her to marry young Anakin (Like Michael and Apollonia). Her political views clashed with that of Anakin, and as she noticed his descent towards darkness she started to drift away from him. She eventually noticed that Anakin is becoming weird in home, and eventually discovers the horrible truth: Anakin is hunting down the Jedi Knights. She broke up with him but Anakin tried to get her back by force, she rejected him and went into hiding. Unbeknownst to Anakin, Nellith was pregnant with his young child.
This is awesome and really seems like the obvious way Anakin’s love interest should have been implemented. I still can’t fathom why Lucas drifted so far off course. Somehow we ended up with a romance between a 10 year old boy and Natalie Portman