Battlemage volconus I haven't seen in a while. Most recent one I've seen is Marohi Erqi, usually on Shockwave Totems and some paper-thin defenses. All I'm saying is that once you divide that 135% by the standard dps support, it's pretty much the same as Battlemage(but one handed weapons only!).
EK with return leaves fewer blades per second in Blade Blast range of the target than Bladefall. EK needs at least one of its notables from Crucible.
Why do you think BF/BB are meh? Usually people hate the 1-2 setup, but you're willing to do that with EK BB, so...?
How are you going to keep the Reaper alive from the Guardian support degen?