Now if someone really does want to commit to a voice mod such as this, I just so happen to have a professional background. I used to work for a small studio where I wore many hats. Writing, casting, art, animation, and of course voice acting.
For privacy reasons I will not disclose the what and where. What I will say is I'm really good at copying inflections, which pairs really well with voice to voice AI.
I have voice models for Aang, Katara, Sokka, Toph, Zuko, Suki, Azula, Mai, Ty Lee, Iroh, Ozai, Kyoshi, Chong the hippy, Azulon, Amon, Unalaq, and the Earth Queen.
While some of these characters weren't even in the show, they reused voice actors all the time so who says we can't do the same? Unalaq's voice could be used for maybe a random Fire Nation guard for example.
I could probably find some other voices if I searched other roles too. My Ozai is actually the Joker. I could probably find a good Daniel Dae Kim if I looked for one.
Now if someone did work with me on this it would take time out of my art commissions so I would have to do it in chunks and charge for it. I work pretty cheap though. We're probably talking like $30 for an entire scene. I'm not one of those Twitter VAs who try to charge a hundred bucks for a few lines of dialogue talking about their feet. If anyone is serious about doing that DM me or something and we can talk shit over.