I know you definitely can't make the blocks and cut them and half and quarters because you will definitely lose your seam allowance. In fact I like to make my setting triangles a bit oversized so my full blocks float and I don't chop the points.
If I were doing pieced blocks as the setting triangles I think I would redraft them out. I'm not sure if there is a set formula for pieced blocks. I only know the formula for cutting setting triangles that are not pieced.