E-Units were engineered for 4 motors.
Your MU scheme is solid... you can tether both motors to one e-unit, even while leaving reverse units in both cabs. Here is the diagram for doing so(the connection between cabs is circled in green, use your choice of connector). If you leave the slave unit locked in neutral, it can be restored to operation by unplugging from the master and turning the E-unit back on.
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