So I have read, as an alternate. I think it would be interesting, seeing Aria and Sonata come back as antagonists while having Adagio as the (anti) / "in between"
shes becoming of reformation, but Aria has taken Sonata under her wing, and it would be a good version of Pinky and the Brain if you catch me haha, give her some actual centered time as the main antagonist, and still give Sonatas goofy personality plenty of time in contrast.