I am specifically talking about using AI to mimic the voice actor. I have used xVASynth and i have seen mods using something called Elvenlabs (name?). If you need your mod to have voiced dialogue, then just do it. How is that unethical? Like if I want MaleEvenToned to say something in my mod, it's kinda lame if half the guys lines are subtitle only. If someone has subtitles disabled, will they even know he is talking? Definitely not going to be my voice lol.
Why is that unethical? Do they own the sound of their voice? I am genuinely curious about that. Does everyone have a copyright claim on anyone who sounds like them?? It's all ridiculous. OP JUST MAKE THE MOD, DON'T WORRY ABOUT THE BILLIONAIRES AND THEIR GAMES!! If they remove your mod, just shrug your shoulders and move on. The worst that can happen is your mod gets removed and that's fine. You aren't hurting the livelihood of these voice actors, you are just making a free mod for people to enjoy.