So create some female characters to suit your requirements. That's what I did when I started adapting games to prose in some of my writing projects. The source material was thin on female characters, so rather than genderswapping any of the male characters, I created some female characters and found reasons why they were "off-camera" during the canon events and could be present in the rest of the story.
'Subjective from series to series' is still avoiding an answer. You're saying it's valid to not want any genderswapped characters in one series, but invalid to object to genderswapping in another. IOW, it's "illegitimate" if someone else's opinion disagrees with yours, is what this looks like.
So why not just refer to the characters by the new names and not even mention the names from the original series? That would make them new characters and therefore wouldn't be a genderswap.
NuBSG by the end *strongly* implies that it is repeating history. So the names (and some events) are just this particular iterations versions of those characters. In much the same way that the whole thing pulled from our myths. A lot of people didn’t like the ending (it had a big huge dose of theology in their SF, which offended some — but is absolutely hilarious when you consider half the stuff in there, including the names.)
By the end, those basically aren’t genderflipped characters, they are just another moment on the turning wheel of history, where things subtly change as it repeats (basically by the hand of god, almost like an engineering experiment being run over and over, tweaking things until the desired result occurs)