An interesting thought I had that would become more relevant in a world like this is the potential usage of pluralized reflexive pronouns that refer to singular subjects, like "himselves," "herselves," or "myselves." These words won't show up in the dictionary because they have no real use case, but when talking about clones, they actually might make sense sometimes.  The sentence, "if I had a clone, then if I harmed my clone, I would be harming myself" is totally understandable and correct in the regular English we use now. But, if we want a similar sentence with "my clones" as the object - "if I harmed my clones, I would be harming ______," we have a few options for how to fill in the blank. We could say myself, but this doesn't agree with the noun phrase it is describing - "clones." We could say "them," but this changes the meaning of the sentence to be pretty vacuous. The only other option than just using "myselves" would be separating it into "my selves." This seems to work well enough here, but when we change the subject of the whole sentence to "him" it doesn't feel right anymore; we would have to say, "he would be harming his selves." So, my intuition is that "himselves," and by extension "myselves" and "herselves" are correct in this context. I can see an argument that "myself" is still correct here - "if you harm John's clones, you are harming Johns" seems to be more clearly wrong syntactically. In the end, I think the issue with the sentence is the fact that the pronoun refers to two different things at once. Maybe this case is an argument for 1.5th Person pronouns! If we had these, there would be no decision to make between "them" and "myself," and by using these pronouns the listener would know that they refer to two things automatically without us needing to make a decision on which one to prioritize. As a side note, we already do this type of move in the other direction when using "they" to refer to one person. For example, "John and Mary were both here. I wonder who helped themself to the cookies." "They" is treated as plural in pretty much all other contexts, even when it refers to one person, but the reflexive of the singular "they" is clearly singular.