Hi Hacksaw,
How about a mini-Lansky Crock Stick or Dog-Bone ceramic sharpener seen here
http://www.lanskysharpeners.com/LTRIM.phpJust pop one or both end-caps off to fit in your slotted holder.
I have used these mini-shapeners often and like them, I carry one in my big game hunting kit.
P.S. On your recomendation (and Taurus if I remember correctly) I checked out the Gerber LMF reviews last night, is it as good a bush knife as everyone says it is? How do you like the serrations?
Thanks
Mike