A transporter copy of George Kirk doesn't sound particularly exciting. But until we read the whole thing, we'll never know for sure.
Well, from the outset, it completely ruins one of the best and most emotional scenes in Trek history. On the other hand, there's no way to bring back George Kirk *without* doing so.
Bringing Jim into the past, though, and having him decide whether or not to alter history again to save his father, that would at least keep me in my seat.