A method that would generate a lot less noise would involve drilling holes in the rows of mortar, I'm guessing every 3rd or 4th course. Then filling the holes with expanding hydraulic cement slurry (such as S-Mite, made by Sumitomo Cement, Ltd.) and temporarily plugging them. I'd suggest locating the holes at junctions of horizontal and vertical mortar joints, enabling the holes to be as large as possible. S-Mite will do the work for you, and the only sound it makes is a dull thud as it breaks the bricks free, raising them from the courses below. The foregoing would allow you to haul off the resulting clumps of still-mortared bricks to a remote location, and breaking them free from each other manually.