>retroactively make cloning automatically unethical

There's nothing retroactive about it. The clone is harmed merely by being brought into existence, because it's robbed of the possibility of having its own identity. The harm occurs regardless of whether the clone actually does change its mind. The idea that somebody can be harmed without feeling harmed is not an unusual idea. E.g. we do not permit consensual murder ("dueling").

>antinatalist positions

I'm aware of the anti-natalist position, and it's not entirely without merit. I'm not 100% certain that having babies is ethical. But I already mentioned several differences between consciousness cloning and traditional reproduction in this discussion. The ethical risk is much lower.

> But I already mentioned several differences between consciousness cloning and traditional reproduction in this discussion. The ethical risk is much lower.

Yes, what you actually said leads to the conclusion that the ethical risk in consciousness cloning is much lower, at least concerning the act of cloning itself.