I started this build but I am only at level 90, which is weird for me because I played LE a lot.
I managed to use some gear I had stashed. This is my take on your build, min maxed so far:
https://www.lastepochtools.com/planner/EAL9Za4Q
The Blessings are not what I currently have, but these are the ones I want to use. The gear is exactly what I am using now.
Pact Severance is surprisingly good, I mean free Attack Speed, Cast Speed (they contribute minimally to animation speed for Fury Leap, War Cry, Blessing of Eterra). Also got extremely lucky with Temporal Sanctum and hit jackpot Suffixes.
I managed to squeeze in a whopping 60% CDR. Basically, Fury Leap and Warcry are on a 3.1 s CD. These are also iFrames, granting Invulnerability. This affects Fury Swipe, so it can now be used every 0.8 seconds. Hard to track, it seems to be affected but it feels slightly slower. Need to check for bug.
I managed to reduce Eterra's Blessing's cost so that I can spam it 2-3 times when I reach Rares.
I lose a lot of Viper Aspect Effect, like quite a lot. I also would need to squeeze more Minion Damage, I am low compared to other Ring options.
The upside, I managed to absolutely MAXIMIZE War Cry. 3.1s CD, Invulnerability, about 700 Health on Use due to the 230% Increased Healing Effectiveness. It vacuums in Mobs, protecting me because of the limited range of Bastion of Honor. So playstyle is Leap, Warcry, Swipe. That means 2x Poison Novas, that melts most things.
I didn't manage to get further than 200 Corruption. And I need to hit 100 to pad some survivability. But it's pretty good, with practice I see it doing fine,
It is also a very, very engaged Summoner. And when and if you die, you know it was misplay. You have 2 invulnerability windows, it is extremely elegant and well designed. Props again for such a fine build!