Dark Empire I And IIs cut could be a nice idea as well. I know it d bea bit of canon soap opera with the Emperor returning as a clone again and again, BUT, it d add a lot to the story as well.

it kinda would introduce the concept much earlier in the time line, and it d explain why they are not really surprised so much in IX that he came back 😄
it d explore some darker traits of Lukes personality (explore more later in the VIII)
it would explain some force powers the Emperor and Luke have in the sequel trilogy
we d see more Jedi Leia, which would be coherent with IX
some super weapon that we d see more developed in the sequel trilogy
Luke as a jedi master 😉

And about making a Canon LOE version, I haven’t read “Ahsoka” but I think I ve heard there were some flashbacks to her encounter with Maul. Maybe you could just include that?
Or maybe just do a one big novel like Game of Thrones and use some parts of other Canon novels for eg. Some trimmed version of “Dark Disciple” as a Volume I, or some chapters of the Shadow Conspiracy novelization. I know it wouldn’t be one coherent story, but, you d end up with a huge Clone Wars canon chronicle.