Note that Trinity already possesses a primary means of generating energy.
Many Warframe ability Augments (such as Saryn's Regenerative Molt) create healing effects which can be employed in the same fashion.
Beware of high amounts of burst damage which may overwhelm a Warframe before they can heal themselves.
Rage increases the time Wukong can actively resist death via Defy.
If the player has Quick Thinking equipped and suffers lethal damage, the gain in energy will be converted back over as emergency health.
When hunting for vaults in the Orokin Derelict, or even outside of the derelict, equipping the Decaying Dragon Key handicap to sacrifice shields will reduce the time needed before Rage can take effect.