They should have to come back to this alien without updating it. That would make it so incredibly logical. Imply that there may be a place where people genuinely look like fake 60’s white gorilla suits with rhino horns.
“If being human is not simply a matter of being born flesh and blood, if it is instead a way of thinking, acting and feeling, then I am hopeful that one day I will discover my own humanity. Until then, Commander Maddox, I will continue learning, changing, growing and trying to become more than what I am.”
Douglas Trumbull setting up special effects images for Star Trek The Motion Picture. Pictures from Cinefex magazine 1, 1980