Given that there is a popular tendency for people to accuse even totally different things of being "eugenics" to discredit them, if you tried to rebrand eugenics as something else people would notice very quickly, they would "accuse" you of being eugenicist, and the debate about whether Plan Y is or is not a good idea would immediately shift to a debate about whether Plan Y is or is not eugenics - which you would lose, because it is.

This reminds me of an interesting analysis I heard about why Heartiste manages to hang on when many people who are much less horrible than he is get laughed off the Internet. If you write some very reasonable liberal enlightened essay about how maybe there's some reason to believe some women are such-and-such but we must not jump to conclusions, people will call you a sexist, you'll have to argue that you're not a sexist, and your opponents have spent their entire lives accusing people of sexism and are better at this argument than you are and will win (or at least reduce your entire output to defending yourself). If you're Heartiste, and people call you sexist, you can just raise an eyebrow, say "Well, yeah", and watch people whose only master-level argumentative gambit is accusing people of sexism have no idea what to do

Heartiste happens to be awful, but I'm pretty sure the same strategy could be applied to reasonable positions. If I wanted to start a site that promoted sexist positions, I would call it www.sexism.com.

If the human biodiversity people had called their movement neo-racism, they would have avoided having every mention of them devolve into painful non-debates like this one. Compare the neo-reactionaries, who are much more politically astute and who were entirely correct to call their movement neo-reaction.