I'd do it, since you guys are busy running things, plus when I thought this idea up, I had some ideas for the fusions personality given the condition of the fusion. It's held together by fear, desperation, their hatred for gems, and no small amount of mutual hatred for nearly everything else. Separately, they'd just be a bit unhinged and distrustful if all gems, but together it'd be a gem that wants the entire world to burn. It'd be a strong villain for both sides of the present conflict.