if i rewrote the Goku Black arc, i would probably blend Heroes Black with main continuity Black, and have him double cross Zamasu instead of fusing. that, or i would have their Fused form retain more of Goku's features instead of going full greenskin, then combine that with the battle damaged Fused Zamasu look we never got in the anime. i find Zamasu losing his mind a little as Goku Black to be much more compelling than the regular story where they just glaze the fuck out of each other till they fuse.

if i kept the greenskin Fused Zamasu, i would have to change the color scheme of his Kai outfit, cause i don't think it looks good with his skin tone. Zamasu's original Kai outfit was more befitting a green man.