You misunderstand. What I'm talking about replaces all self-healing with shield generation. Using IB does not recover HP and is not affected by current HP. The shield generates independently, so you don't need to be at max health.
Obviously I don't have a complete picture of how this would work. I don't know if perhaps a buff or nerf to potency would be needed or what. I'm not proposing this option as a replacement to the current changes; as I said, my idea will never be implemented. I'm just throwing it out there to discuss for the giggly shits.