Oro's Sacrifice Build, looking for critics

I was theorycrafting around the item and a specific underrated skill: Cast on Melee Kill



My idea is to use the upcoming preventive strike, because of its three base stats:
- High base damage (165%)
- Can't be Evaded (you save two points that would be spent in Resolute Technique, and keep your ability to crit)
- Adds some defense (we don't have much details about it yet)

The only con is that you need (100% necessary) a 6L. I wasn't able to figure this out.
The links would be as follows:
Preventive Strike > Life Leech > Endurance charge on Stun > COMK > Discharge > Fire Pen

Here's the Skill Tree I've come up with:


Given the high per hit dmg (see questions below) of a 2h weapon, almost every hit would grant you an endurance charge. You have enough hp regen to handle (and outregen) Bloodrage, plus the 25% ignite chance, plus the 5% crit chance (you gain frenzy charges on ignite). And if you're rich, you can add Romira's Banquet.

As for reflect, it has ben extendedly proven that Vaal Pact with a LL gem will prevent you from dying.

My questions are:
- Will the dmg be enough to stun with only one offensive gem (Fire Pen)? (Take into account ECoMS' stun treshold reduction)
- Is there a better build possible for this setup?
- Am I forgetting something?

Thank you for your time and good luck.