One feasible option you seem to have overlooked is to pick a room with a door that opens into your listening room. Buy a new door that fits the room, and place the old door in a closet out of the way until you move out. Install the drivers in the new door. Be certain to use the most solid door you can find, and install closed cell weather stripping on the door jam to minimize leakage. Also mount an under-door seal(I forget the proper name for these) to reduce leakage. Of course, you have to be willing to have an odd looking door.
On the other side of the door, you can make it less ugly in the next room by building a wood frame to extend the back of the door by about 8"-10"(or whatever minimum distance is required to clear the back of the driver), and applying a fabric that matches the room.
-Chris