^^^^I actually wouldn't mind that idea. Though I also thought a good idea would be to have her co-star in another one of the solo films and then pop up in Avengers. You wouldn't necessarily have to show her origin, you could just have her pop up with powers already then through the course of the movie you could have her reveal the origin. Just an idea.
Another idea I had was they could have Carol adopt both persona's in her movie (Ms. and Captain Marvel). She starts out as Ms. Marvel and through the movie she adopts the persona of Captain Marvel, of course without the original Captain Marvel that name might not have the same meaning as it does in the comics.