[The Collector's Room]

I don't think it would be un-ethical to CG Serling into the movie. In fact, it would probably be the best solution to the problem. No matter who you get in, no matter how good they are, they won't have that Serling charm.

If you're re-creating episodes from the original series, the dialogue will already be there and recorded so it would be the best option for me.

As Human Man said, if Carol was okay with it then it would be fine.

If not a CG Serling? I don't know who else I'd pick. If it's Leo's production company, he himself could actually be the host. He's got enough charisma to carry it and he's a great screen presense. In fact, with his face on the poster the film could do quite well.