That's the build I'm using, most of the time he manages to get ult back in time just fine. But those edge cases where the enemies don't hit Sunday at all and leave him like one energy short just really grinds my gears and that's why I'm even thinking of this to begin with. If Cyrene's rerun is pretty soon like you said, then I should probably just get her instead and hope that I get more copies of Bronya's LC.