I’m an Expanded Universe fan as well, and I’m always in contact with the Expanded Universe community. I can tell you, from personal experience, that most EU fans don’t like the idea of EU characters being adapted into the current Canon timeline, regardless of whether they are adapted faithfully or not. The majority of EU fans love characters like Mara Jade, Thrawn and Revan precisely for the environment that surrounds them, because it’s the universe they exist within that makes them what they are. Which means that it makes no sense to adapt them to another universe, because they are actually not the same characters that EU fans use to love. The majority of EU fans don’t want Canon stories with EU characters arbitrarily inserted in them, they want the actual EU timeline to be continued through the publication of new stories, new books, comics and video games that are set specifically in the EU timeline itself. Having two separate but equally valid timelines is not confusing, and the material that belongs to the EU timeline can still have the Legends banner on it in order to avoid confusion. Disney is perfectly capable of managing two different timelines, and yet they decide to keep the EU as dead. If they really want to do something for the EU fanbase, then they should authorize the publication of new stories set during the Dawn of the Jedi era, the New Sith Wars era and the Legacy era. Furthermore, they should make a public statement announcing that TCW is not part of the EU timeline, because the show is technically part of both timelines, even though the majority of EU fans completely disregard it in the context of the EU, since it totally contradicts the Clone Wars Multimedia Project and the timeline of the Clone Wars that was already fully established before 2008, with all the books, comics and video games that used to be part of it.
I’m also a Prequel Trilogy fan, and I can tell you that not all Prequel Trilogy fans use to love TCW. Yes, the majority of Prequel fans love the show, but those who love the show don’t necessarily constitute the entirety of the Prequel fandom. Your propositions for Prequel fans are pretty valid and I don’t want to criticize them, I just want to make it clear that not all Prequel fans actually care about a Clone Wars continuation. Something that all Prequel fans (regardless of their opinions on TCW) might appreciate, though, is a Special Edition of the Prequel Trilogy that tries to improve the way the CGI looks and inserts some of the deleted scenes.