I think you mean Native III and Caly3, both of which come with wire clips. You should be able to get a replacement from the factory if you call them up.
As for retrofitting wire onto a knife that had a sheet steel clip, it's probably possible, but would require modification as the Deacon suggested. Almost so much modification that you could replace the entire handle scales and/or buy the wire-clipped model for a similar price. If you don't want to do the dremeling, STR might take the job. See his forum under Makers.