> but there is in fact precedent against trying to hire a sound a like over the one you want to sound like. You can't be in talks with Scarlet Johannsen, reject her, and then hire a sound a like and say "talk like Scarlet". It's pretty clear at that point what you want but you didn't want to pay talent for it.

You're referencing Midler v Ford Motor Co in the 9th circuit. This case largely applies to California, not the whole nation. Even then, it would take one Supreme Court case to overturn it.