Great idea and worth the extra time! I'm starting two very heavily pieced quilts for my GDs and will use this! Guess if you use a little longer stitch for that it will come out easily if needed.
When you say to flip seams do you mean in the middle of it? Say if the first end is correct you just flip the seam in the middle so the other end butts too? I've done it and feel OK about it, not thrilled, but OK.