If I understand what you are doing, i would use a 4 inch flexible dryer hose attached and sealed to the concrete blocks on one end, and going into the rear of your trap box, ( I like a 10 frame deep.) If all entrances/exits are sealed, then all bees going and coming will have to be through your trap. I would not bother with sugar water or pollen patties. Let them get used to going and coming through the trap box.
If I understand your post, the trap would only be a foot from the colony entrance/exit. Let the bees get used to going through the hose, into the trap, then out the trap to the outside. When they return they will enter at the front of your trap, pass through the trap, then through the hose, and then back into the wall.
Since your trap may not be near the brood nest you may not draw out the queen or nurse bees even if you add a frame of unsealed brood. In walls and buildings the brood nest may be several feet from the entrance that the bees are using. In this case I would install a funnel inside your trap, (use screen and form a screen cone or you can use a conical bee escape funnel). Any bee that exits the colony will have to go through the funnel and into your trap in order to go outside. In this case you will initially get mostly field bees, then as other bees (including drones) exit for rest or cleansing flights they come through your funnel to the outside and then cannot get back into their colony because the funnel will trap them in your trap. At this point they take up residence in your trap. Providing them a couple frames of drawn brood comb will help. Field bees will start depositing pollen and nectar in the trap.
Leave the trap on until the box is either full of bees, or, you get enough to start a colony.Leave the trap in place, move frames as you need to. Eventually you will weaken the colony so badly that the queen and the remaining bees will come through your funnel, into your trap, and they cannot get back to the colony. Move them away, or let them rob out the honey in the walls. Trapping finished.
Hope this is helpful. Good Luck.
cchoganjr