For whatever reason, it's not showing me the "add a comment" link on your previous post; so I'll do that here. Absolutely no need to unpick the buttonhole stitch, IMO. I get puckers, too, and have just found that adding other "stuff" (more stitching, buttons, sequins, beads) disguises a lot of it. I think it's the nature of fancy fabrics to be uncooperative!
What you've done is absolutely beautiful; don't make more work for yourself!