Here is my test setting, with the setting and corner triangles drawn. I also added some aqua/teal circles to the center of Block A as a way to easier move some of that color beyond the sashing and skinny border.
I’m thinking about doing the garnet edge triangles as QST (except the cornerstones and corners) to avoid the bias edge along the outside of the quilt center. It will be the same size as the hourglass blocks, so I can use the same QST AC die.