I agree that the solution here is to add an accessory color to them. People would still have the option to have skin-color hair, and it's not like an accessory color is already being used for something else. Even the hairstyle with the pin, that should be giving us an accessory color option, doesn't have one! I always felt like the other hairstyles that do this (like the backwards, kinda twisted branches) should have had a bit of a gradient/texture on them at least. On most characters, the lack of color variation just ends up looking weird.
That said, I did end up having this look grow on me, so I wouldn't want to lose it to some belated changes now. The hair + accessory color fix seems like an obvious solution, with the only 'difficulty' maybe being the addition of another dye channel.