After looking for the wire from the front passenger side of the engine, I'd suggest working on it from there would be your best bet.
With a small pair of hands, you could possibly get to the connector (between the intake chambers and the engine block) to get it unplugged from the sensor itself, make the repairs to the wire with both the wire and the connector out front and center, then, once the wire is repaired, fish everything back into the opening between the intake chambers and the engine block and plug the connector back onto the sensor.