When people have done the job a few times they realize this. Also the amount of brickwork you could lose takes little time to relay, so for a pro it's not worth the hassle of digging out a size 0 acro that isn't really needed.
If your not having the bricks on display once finished drill and screw a 4x2 piece of wood across the width of the entire chimney breast on the coarse above your lintel, it will hold the brickwork in place fine.
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