Suggestion: New character voices.
Though I think there’s virtually no chance of it ever happening, I’ve requested alternate voices here. As to fans providing the new voices, I’m pretty sure that could cause problems with the Voice Actors Guild.
Yeah, I’m not sure if voice actors are unionized similarly to actors, but if the situation is roughly the same, then it’s generally bad karma to mix voice actors from both sides of the fence in order to hire non-unionized actors for no benefits and less pay for major functions. It’s very possible, but you risk losing the opportunity to work with guild members at all, especially if everyone knows that your budget is already big.