Maintaining Pain Attunement

Pain Attunement comes into affect at under 35% HP which can be played with relative safety with a good amount of energy shield.
As a method to maintain under 35% HP, is it possible to use auras to make more then 65% of your HP reserved to trigger it?
Oh, this is with auras while having Blood Magic so it would reserve HP instead of Mana. (Vitality + Purity to get 20% HP and increased survivability, perhaps)

Yes reserved health does not count towards your maximum health so if you reserve more than 65% your current health is less than 35% and therefore you're on low life.