HoP-Absolution 100% Lightning Conversion - Possible League Starter?

Repost with updated pob; original Post: https://www.reddit.com/r/PathOfExileBuilds/comments/wh5dtw/build_idea_herald_of_purity_phys_to_lightning_and/?utm_source=share&utm_medium=web2x&context=3

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This might work out as a league starter but requires two good rolls on Mana reservation for HoP on Circle of Guilt and could become rather expensive at league start.

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This is where i got so far:

https://pobb.in/EC33Dr_SaPw_

Playtested with a lvl 89 Scion in T14 to 16 maps; Support gem lvls at ~15 skill gems lvl 21. It works pretty good in maps but struggles against bosses. Defences are rather poor. A lot of Unique Items are mandatory which leaves little space for mana and ressist mods. Therefore Purity of Elements is a must. I am also using Determination for phys mitigation. There is no more room for a damage aura, since HoP reserves quite a lot of mana. Currently my Mana is just enough to cast Absolution once and wait for mana to refill. Sentintels of Purity can be maintained with storm brand linked to hextouch and culling strike, wich fits quite nicely into the build.

Current Problems:

• Mana Cost; might use Eldrich Battery; Big changes to skill tree needed
• Defences: Ressis are not so easy to cap for all the unique items
• Support Gems: Not sure about pob calcs. Can someone help me out on this?

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Every Feedback is appreciated.