i hear arguments about "lore"

but the entire point of your character is that you can give them whatever backstory they want. what's so wrong about having a male highlander who does not observe that particular custom/tradition and does not shave their eyebrows? and this presents another oddity: why do the highlanders of the 1st shave their eyebrows? i thought the cultures of each race were supposed to have drastically diverged from one another compared to their counterparts on the source.