I have been searching through the BIA Technical Notes for a recommended detail for supporting brick veneer on the sides of a dormer...is there a preferred way? (see attached image)
I think a L6x3.5x1/4 LLV would be best to support the brick.
The longer vertical leg allows more than one lag bolt at each stud which may be necessary to support the load.
I generally don't specify bolts larger than 3/8" diameter in the 2" face of a 2x4.
Also pilot holes should be specified to prevent splitting the wood.
I like msquared's advice. Don't forget the vertical fins on the angle to keep the brick from sliding. You'll need to determine the size/spacing of these fins based on the allowed stear stress in the horizontal mortar joint.
Chances are a good mason will have some experience with this. Consult with one on your details.
My suggestion would be to use one single "fin" at the bottom and then use a spacer of some sort in the mortar joints the rest of the way up the hill until you have a level row of brick. Similar to tiling a tub surround. The spacers will wind up buried in the mortar joints.