I'll cut to the chase: no, it's not viable. EK DPS is terrible because (A) the imbues don't scale with Spellpower the way Spiritual Retribution does, (B) the SP cost & cooldowns for EK Cleave & Tempest are too high relative to their power, IMO, and (C) there's none of the tasty crit & Melee Power bonuses all the other melee PrEs have been getting for the last 2-3 years.
The only things good about EK are the defensive buffs, IMO, primarily the Imp Mage Armor / Shield / Arcane Barrier line. I would make a
flavor tank build with EK as a complement before I tried to make a melee-DPS build based on EK.
My point isn't "don't make a melee build which uses EK;" it's "don't expect EK to do the heavy lifting for your DPS, b/c it's weaksauce."