Wouldn't it work for fibro sexlink too? Or are they too fibromelanistic?
The question mentioned a barred hen, so I didn't bother to consider other options when I answered.
Fibromelanosis is not on the Z sex chromosome, but the gene that allows dark skin is. So yes, ayam cemani rooster crossed to a hen with light skin should produce chicks that can be sexed by skin color (dark-skinned daughters, light-skinned sons.)