I think how the genetic augmentation ban was portrayed in Una's case in particular - a military court martial - was similar to "Don't Ask Don't Tell", so LGBTQ+ groups do seem to fit better than, say, race or sex. Even with DADT no longer in force, there's topical parallels, like you suggest, with trans people. But there was an emphasis on the Illyrians' genetic augmentation being "their custom", so you can apply religious or cultural prejudice equally as the allegory.