Scion Oro Flicker Immortal Call

So I have been playing the exact same build as presented here;

https://www.youtube.com/watch?v=E_d1Iavatqw&list=WL&index=3&t=0s

[3.6] Infernal Flicker Strike Build - Ascendant Scion by "Path of Exile Builds"

But I have been wondering can i change it a bit to generate endurance charges and use immortal call with it? At super high level end-game adding immortality seems like a must-have for flickerer. What would be the best way to generate endurance charges with this build? What gems should I swap for immortal call with supports? And do I need some specific respec passives into diffrent areas? What about jewels? Can this build even work with immortal call?

If I use a setup of immortal call lvl3, cast when damage taken support lvl1 and increased duration lvl 20 if i take 2000 damage does it cut it at CWDT damage threshhold 528 and give me immortality for 0.4 sec?