Would this work to sharpen my honshu karambit?

Stay away from pull through. Even ceramic ones leave nasty burrs. A ceramic rod would work great for honing/touchup, sharpening not so much. Coarse diamond rods or even a crystolon would work well for resharpening a dull edge. Given the nature of a karambit I'm not sure what utility purpose you'd use it for that would dull it.
 
Between only the two sharpeners listed, I'd go with the Lansky Turnbox set. As mentioned, the pull-through sharpeners are better left alone.

For the deeply-recurved blade and AUS-6 steel, some wet/dry sandpaper wrapped tightly around a cylinder (PVC pipe, etc) would likely be my own 1st choice for it, used with edge-trailing strokes (as with stropping). Some 320+ grit would fix any heavy edge damage, and anything from there and up (to 2000+) could work for touch-ups and maintenance, depending on your desired edge finish. The AUS-6 steel will grind and hone easily with SiC or AlOx wet/dry paper, from brands like 3M or Norton.

Any round rod-type sharpener would also work, like the diamond rod previously mentioned. I'd avoid flat stones for now; they can be used, but can be awkward for someone not used to sharpening recurved blades on flat surfaces. Only the corners/edges of the flat stone will be in contact with the recurved edge, so pressure must be kept very, very light; else the edge will be damaged by it. If flat stones are used, the narrower ones will fit the recurve more easily.


David
 
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