What to do, What to do?

The antique kimono material on my sofa pillow is falling to pieces.    

That is to say, the Mon or Japanese family crest symbol, is deteriorating.

And I'm in a quandary as to what to do.  Do I sew a backing onto the underside to stabilize it and let it continue to deteriorate? Or do I put a backing on and embroider the surrounding fabric? Maybe I should put a contrasting color behind the Mon and let it lose threads creating a whole new process and design?

Or maybe I should locate some other fabric or motif and applique it over the Mon, creating an entirely new design?

The whole pillow is black and white.

I really don't want to trash it; I love the feel of ancient silk.

P.S.  I forgot to mention, the bottom of the Mon is down to horizontal threads in the lower 1/3; the top of the circle is totally coming unfastened and can be lifted up.

Any ideas?