The main idea i had was to individually sleeve these and potentially remove the split part as i don’t like the idea of buying extensions and stuff even more cable inside my case.

On the other hand i would be ok with removing the combined sleeve and 3d print some combs to make the cables look better, especially since the mobo cable has a huge piece of heatshrink making it nearly impossible to look good.

But i have no clue what that little component is and if it only exists for the split that is in the cable.