> I don't see a solution to this

It's actually simple. Take David Attenborough's name out of the picture.

"A generic British guy is now narrating my life" isn't as funny as implicating a known celebrity, which is where the legal issues would arise. A generic British guy isn't going to sue you.

Hell, you might even be able to get away with "A generic British guy who sounds like David Attenborough is now narrating my life."

Sure. The difference is some voices, like David Attenborough or Samuel Jackson are instantly recognizable to a large audience while someone who isn't famous' voice is not.

Where to put the bar is a specific issue, but the exemplars in their category stand out as recognizable.

>ALL simulated voices sound like some real person somewhere

By the same logic, all simulated faces look like some real person somewhere, but I wouldn't expect to simulate a face that looks like Brad Pitt and then use it in a TV commercial