Nancy_in_maryland - have you tried to use gimp in your buttonholes? That should stabilize it enough. Let me know!

I do believe that the article refers to buttonholes that already have the embroidery as part of the buttonhole.

I would also be careful as to what stabilizer you use because it will show on the back side of the buttonholes. I would definitely use a tearaway in a colour that would show the least. The water-soluble stabilize such as Badgemaster might also work.