To Create Glitter using SSS shader - could use an independent specular/roughness map in the texture so at different angles we can have glitter
You could duplicate the SSS shader and write it for glitter so it changes based on light settings and angle. We can't use the existing roughness channel or metal channel to make this work because the sparkle will remain static.
I achieved glitter in iC8 but not yet refined as it potentially could be. I used a combination of Subsurface scatter, Spectral snow under the glare options and you can probably imagine the rest with texture settings.
I have some other ideas that may help and provide more surreal glitter effects.
