Just a concept at the moment, but the gardener/florist knife series are symetrical about the middle pin so why not "top and tail" the blades/springs of a Florist and a Daypacker and make some nice slim scales from wood or horn?
I have a couple of florist knives and the black one has Brass liners.
I'm thinkin that could make quite a nice (if somewhat large) slippy.
VERY Q&D mashup of the two images above, no attention to nail-nicks/ blade order etc, just a concept overview.