ManiacQuilter2

I am having difficult pressing the seams flat on a handles for these quilted Bible Bags that are going with our missionaries to the Philippines again this fall I am just getting an early start. The handle is a cut 2.5" x 28" and I fuse interfacing inside before turning. But I can't figure out how to get that seam pressed flat when turn right side out so I can have it place on the side. I looked for some bias pressing bar but none were wide enough. When I press the seam flat, there seems to appear some wrinkles caused by the interfacing moving. I stuck a large wooden knitting to press the seam flat but concern about getting burned with the iron. Any suggestion??

Also if anyone can come up with simple pattern that I can make the pattern into 3" finished blocks, I would appreciate any suggestion. The size of the unfinished bag is 12.5" x 18.5"

THANKS !!