>How about killing the bees inside the wall and then allowing other bees
>in the area to rob the honey and remove it.  The wall could be kept
>sealed until there is no honey flow and robbing should take place rather
>quickly.  The disadvantage is that there will be  lot of bees and other
>insects around while this robbing is underway.  However, it might be
>better than tearing the wall down.
>
How would you kill the bees in the wall (without also killing the robber
bees later)?