Slams or KB for early t17

My league strat for the first 3 days is going to be start at destructive play as early as possible > do maven invitation rota and shaper/elder/maven fights > move into t17 for scarab/boxes/boss fragments, ending with some uber elder/uber shaper kills.

Ive done zerker slams twice now, so im familiar with it, but ive never played earthshatter. I imagine it can pretty comfy doing the listed strat, but the drawback is that i dont love the playstyle. I can stomach it for a few days but its not exciting for me and i will absolutely reroll by end of the first week.

KB/KR looks stupid fun, but it's probably too risky to go this route if the new skills don't live up to the single target dmg hype.

If i go KR and it sucks, what are some reasonable build swaps i could do on a witch or ranger that could still do the strat listed on 10-20 div early game budget?