Quantum and GR/SR are meant to misdirect us, in order to believe it's not possible. We need to unlearn this nonsense so we can focus on understanding how ZPE is possible. Heres a very simplistic crash course.
There is a medium which is the source of all energy. We manifest energy from the medium through specific arrays or archforms, like an AC motor; that is, inducing a current from magnetic fields. ALL of the fathers of electrical field theory understood very well that there was a medium, call it aether or (the original definition of) inertia, or energy at rest, and this was how they developed the electricity we use today.
Unification is already achieved. Fields are modalities of the aether. There is only one true field, the dielectric, which is inertia and acceleration. The loss of inertia is expressed in this world as magnetism, which is force in motion, and magnetism is powered by the dielectric. Magnetism is inherent to every single atom, it's want gives this world volume in the form of 'space'. A magnet is nothing more than a coherent field, and it is always expressed by lines of centrifugal divergence (magnetic) and centripetal convergence (dielectric).
Every single thing in this reality is an expression of this field. We all manifest from the source and when we 'die' we go 'centripetal' and we return to source.
Tesla's AC motor array is an inverted magnet. The logic behind figuring out how to harvest zero point energy is using the correct array, coupled with the phi ratio, so that we have a coherent, nondestructive source of unlimited energy.