I've tried my best to push this build further since last time and have now successfully cleared all Invitations, including The Feared, and become resilient enough to just tank Sirus Die!-beam on A9.
The key upgrade has been swapping the block framework for an aura framework that provides a lot of armour. With Prism Guardian as my shield, I can squeeze in eight auras, and I have enough aura effect to still get the same fire res I would wearing the old shield.
I had planned to include some bosskill videos, but I krangled the recording so all there is is this Delirious Strand map.
Will try to record again in the future.
Updated PoB Link