I like, I like.
I’d suggest using this for the weapon to get some added RR.
Also you could always use the Blood Orb of Ch’Thon to do the Chaos conversion on EoR giving you 100% EoR.
Use can also use Rah’Zin’s Gem to add extra Chaos RR to Curse of Frailty - but after re-reading it defeats the purpose so maybe not…
OR you could use 2 Voidheart’s and a Mythical Sash of the Bloodlord if you need to keep the Shield and Sword as these would also convert all fire damage to Chaos so you can go full Chaos Sentinel and gets you heaps more Chaos RR which is really important and quite hard to find
But I’m a sucker for Chaos builds, I think Chaos is my favorite damage type so I like where you’re heading with this.
EDIT: Realised you’re already using the sash and a voidheart, so just use 1 more voidheart and you don’t need the amulet and can opt for Rah’Zin’s amulet 
EDIT 2: misread the amulet modifier and realised it converts the Physical damage, not the fire damage lol… But the extra void heart would still go a long way in converting all the damage of EoR to Chaos.
Or just use Mythical Wrath of Tenebris with the 2 rings and the sash and you have 100% Physical and fire converted to chaos and 50% of the lightning converted