Do the seams always have to nest? Did you ever watch Jenny Doan press her blocks. She presses from the right side sometimes and lets the seams fall where they may.
I have also flipped seams when I come to sewing them together and both are headed in the same direction. One goes the other way before it gets to the needle. After the quilt of finished, that is barely noticeable. Only a quilt judge would complain about it.