Was tinkering with Witch, wondering what build I should play and when I encountered Charged Mines support, this idea about Power Charge stacking with Badge of the Brotherhood came to my mind and there it is.
pob: https://pastebin.com/v5QYWiLk 10 Power and Frenzy charges, 85% Fire and Cold resistances, 83% Lightning, respectable amount of ES and recovery. On my first Simulacrum I went to wave 30 but failed hard and didn't finish it, will try again after I level up, I think I am gonna make it after all.