I was already assuming you'd just buy the Eureka.

Was just showing the hair knot. If you are an obsessive like I am, you might want to make a hair knot with milliput (very easy), make a very simple one part mould for it (again, it's very easy to do), snip off the top knot, and stick the new knot on the back. You could add the forehead ribbon quite simply, even with a thin strip of paper glued on.
Or just fudge, no one will notice anyway. The Eureka are very tidy figs.