So, I’m not sure if you frequent these boards as much as some other people on here. But there’s this AI voice tool that’s been making the rounds around here: https://fakeyou.com/?vocodes=1
Obviously, I know you’re wanting to use actual people in this. But I figured it would be a good thing to have in your backpocket at least. And who knows? Maybe you’ll be able to use it for some of the characters that would be more difficult to impersonate (i.e. Darth Vader).