Heck, one of my requests for High Elf customization also inversely adds Void themed customization.
Turning the hair tentacles into a toggle like the Night Elf hair leaves not only gives the potential to remove unwanted tentacles from the Void Elf hairstyles that currently have them… it also has the potential to ADD tentacles to any existing or future hairstyles that don’t come with tentacles by default!
Everyone can indeed be happy! 
The decoupling of tentacles from the Void Elf hairstyles also makes it easier to share them with Blood Elves (and possibly other races) without issue.