Vitality Oathkeeper - how to make it work?

I feel confused and like I must be missing something. Oathkeeper obviously has Vitality damage as part of its design. Celestial Presence gives Vitality RR, Path of the Three buffs Vitality damage, and Dreeg’s Reproach converts Fire -> Vitality damage. Yet I can’t seem to find any way to make a Vitality build where Oathkeeper pulls its weight, either as a leveling build or as an endgame build.

Here are the pain points as I see them:

  • Celestial Presence is the best Oathkeeper skill for supporting another mastery’s vitality skills, but it requires a 50 point investment to get to.
  • Dreeg’s Reproach and Scion of Dreeg both split you between Acid and Vitality damage.
  • Aegis, Vire’s Might, and Judgement all lack an obvious way to make them into Vitality skills. You can sort of do it by stacking conversion from various sources, but that makes you very dependent on some very specific gear. If you’re stacking non-skill-specific conversions to vitality, then Path of the Three is no longer useful, because it competes to convert your damage into acid.
  • Mythical Death’s Reach has Fire -> Vitality conversion Eye of Reckoning, but it’s lacking attack speed and leaves you with the flat phys and lightning damage unconverted.
  • Korvan Reaping Halberd comes close to working as a leveling MI, but it’s obviously designed around Bone Harvest.
  • If you aren’t focusing on Oathkeeper’s damage skills, then you need to be using a shield, retaliation damage, or both to get good mileage out of its support skills. Ascension and Resilience seem strong on a CDR build, but I’m not convinced that Oathkeeper is worth taking for just those + Celestial Presence, compared to other masteries that have more synergy with a vitality build.

Is there some amazing item I don’t know about that makes a Vitality Oathkeeper great? Some combo with another mastery that isn’t obvious? This is really bugging me.

Don’t forget this:

https://www.grimtools.com/db/items/12601

Ok, that’s an interesting item, for sure. It could make for an interesting Chaos/Vitality caster build, if there are enough other relevant items. Too bad there aren’t any Chaos/Vitality constellations, as far as I know. Maybe you could stack enough chaos -> vitality conversion from a few different items to make it a pure vitality build? Get some CDR in there and you can be a Judgement/Doom Bolt caster. Hmmm…