Try this:
Project your Text-spline on to your ribbon, maybe extrude the text,
make your text a child of your ribbon-spline,
drag your ribbon-spline and text-spline into a null,
drag the wind-deformer into that null as well (first place),
the wind-deformer should now effect ribbon and text together.
(Maybe you like to use a Plane-object for your ribbon and deform that in the wind)
Cheers
Nolan