Really, why couldn't Janeway have used the displacement wave to send the Array back to the Alpha Quadrant with them? The displacement wave obviously didn't originate from any part of the Array, or else there would have been 70,000 light years worth of planets, debris and ships littered around the Array from the origin point to its interception with Voyager
in the Badlands. Just set the thing to activate a wave 1,000 kilometers off to the side of the Array so that it picks up said Array and Voyager, then voila! No Prime Directive violations, no Kazon overtaking the Array, and Voyager's back in the Alpha Quadrant with the Maquis getting prosecuted to the fullest extent of the law.