New answers tagged masonry
If you'd like to minimize use of concrete, don't use any. I have 4 sheds that have been sitting for 14 years on sections of pressure treated wood, set on top of the ground - and a 5th that's on 4 pressure treated wood posts set into the ground. No concrete at all. Wooden floors (not pressure treated - only the ground-contact wood is PT.) Nice and dry.
I would bypass the drywall and long screws and flat mount 2x4 to the brick and then attach the TV mount to the studs with 1 1/2 wood screws. You would cutaway enough drywall to achieve a flat mount. You might have to add a 1x4 overtop to get the proper flush or slightly proud mounting.
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