Carol, Buttonhole stitch and blanket stitch are the same except that the buttonhole
stitches are closer together. I see what you mean about not being able to use a
machine on those pockets. I'd be a little afraid to take them off too, for fear I wouldn't
get them back in place perfectly.
In the tutorial Gillie shared, it mentions the blanket stitch instead of buttonhole stitch.
The buttonhole shown looks pretty raggedy, but then bigger thread was used for
You could draw a line with a chalk marker or other marker that won't leave a mark,
to help keep stitches even...then just stitch carefully. You can do this!