Here's an idea:
{EDIT: updated as my brain cogitates this}
4 wires, three of which carry current in one direction, with the 'back-haul' current going through the bottom wire.
The center two wires are connected together with a very thin (super?)conductive strip (colored red in picture above). The wires have to be very small for the effect to work.
What does this get us?
Well, the electrons in the left-hand and right-hand wires will push upward on the electrons in the top wire. Action/reaction... the electrons in the top wire will increase in energy and push downward on the electrons in the left-hand and right-hand wires.
At the same time, the relatively more positively-charged bottom wire is exerting a downward force upon the electrons in the middle wires.
This creates an energy profile (shown in blue in the image above). Two energy hills and an energy well.
What does this get us?
We get energy 'hills' on the left-hand and right-hand wires, and an energy 'well' on the connector between those two wires. This tends to push the electrons in those wires together (into the energy well)... rather than repulsing each other, they should combine, forming Cooper pairs.
The Cooper pairs migrate to the central conductive strip between the two middle wires.
What do Cooper pairs get us?
Well, if the wires are small enough and the voltage high enough (giving a highly-sloped energy profile sufficient to form Cooper pairs), that gets us room-temperature forced superconductivity. Usually, superconductivity is a result of electron-phonon interaction (with the phonon being the collective motion of the positively-charged metal lattice), requiring very low temperatures so that the electron-phonon interaction isn't disrupted by thermal energy (the interaction is very low energy, and easily disrupted). The effect described here doesn't suffer such limitations... as long as current of sufficient voltage flows, the electrons have no choice but to pair.
At the same time, we should get a voltage magnification effect in the top wire because of that energy profile pushing the electrons in that wire into a higher energy state, while in the bottom wire there is a lower energy state for the same reason.
It's an induced-superconductivity voltage pump... the electrons in the middle wires combining into Cooper pairs cause the electrons in the upper and lower wires to reach higher and lower energy states, respectively, increasing the voltage.
https://en.wikipedia.org/wiki/Cooper_pair
Cooper showed that an arbitrarily small attraction between electrons in a metal can cause a paired state of electrons to have a lower energy than the Fermi energy, which implies that the pair is bound.
The Fermi energy is the difference between the highest and lowest energetic states, and can be thought of as the average energy.
That "lower energy than the Fermi energy" leaves some energy which must be transferred elsewhere... it is transferred into an increased voltage between the upper and lower conductors.