They could actually do Highborne as another model tab on the Night elf CC. Just like on the worgen one you can select the Worgen tab or human tab to customise either form.
Night Elf Highborne Tab
On the Night Elf you have the Night Elf and Highborne tab.
- Click the Highborne tab - you get the thin model of the Nightborne but with Night elf ears.
- You also get it in the night elf skin tones, night elf hair colours, maybe some nightborne hairstyles.
- You get arcane tattoos, star effects, and instead of vines you get headdresses like these
https://imgur.com/a/lA7CMa9
https://imgur.com/VbQUtfa
You do have a body type toggle to go between normal night elf size or the skinnier size also used on the nightborne model.
Void Elf
Similar can be done for void elves. On the void elf CC screen you get Void elf and high elf.
Farstriders
I do not recommend this for farstrider though. Although it could be done there. Instead for Farstriders I recommend:
- Farstrider Warpaints
- And simply adding more overgrown beards and hairstyles
- Adding a scar customisation slider