Griefed my main's Vykas lockout this week in order to do this :(.
Thanks to the people in the party willing to let me try.
Overall took 4 attempts and about 40 minutes; the first one was a heartbreaker where I almost did it through multiple enrage phases during final stand stagger.
Full VOD available at ttv/Useumm.

Gear :
1505 ilvl
22 Weapon, 79 Quality
6 Hallucination, Grudge/KBW/CD/BE/ADR 2 FPE 1
Mostly 7 Gems; 9 Barrage/Homing/Air Raid, LOS 18

Definitely doable with much lower gear if you're good at doing the stagger phase in berserk.