Personally, as long as it's provably safe, I'm fine with it.

As far as I'm concerned, if my consciousness is intact, and my body is a carbon copy, that's me. I place more weight on my consciousness being me than those specific atoms being me.

Besides, we all shed all of our atoms and replace them with new ones dozens of times throughout our lives. So we've already died in that way, I guess? But then again, it doesn't happen all at once, it's more of a Ship Body of Theseus type of thing.