I installed this L channel on the drywall as tight as I could but the brick is so wavy I'm left with this awkward gap. What's the solution to fill this? Scribing the drywall isn't something I want to do. Am I stick cutting out these bricks and putting them in flush?
Buy a grout bag and fill it with mortar. Squeeze the grout into the area between the metal corner and the brick. Making sure the gap is full an level. Let it dry to a point where you can scratch the joint with a stick or tool that has the finish that you like.
I would fill the gaps with spray foam about 3/4 the way, let it expand and dry and then then go back with drywall mud and fill the remaining void. If any of the spray foam comes out, cut it out a bit so you have a place for the mud to fill.