I have lots of crooked knives. I use an assortment of 8" pieces of metal tubing as mandrels. I wrap the fine silicon carbide sand paper pieces around those and secure them with strips of black electrical tape at each end.
Mandrels: dull 7/32" chainsaw file, 1/4". 1/2" and 3/4" wooden dowels. A couple of pieces of thin wall aluminum tubing from a junk lawn chair. Tennis ball for the various adzes with their cupped blades.
I hold the knife out over one knee and use only pushing away strokes with the abrasives. You have to learn NOT to wobble your elbow. Strictly 6 or 8 or 10 degrees angle. Whatever.
Stroke. Stop. Up. Back to start. Straight down. Stroke again.
If you whip the rod over the edge with elbow movement, that rounds off the fine carving-sharp edge that you need.
At the end, I have a chunk of Chrome Green honing compound, some sort of waxy carrier. I wrap the mandrel with an office filing card and scribble the Chrome Green all over it. Same exact process. 5 strokes per edge ought to be enough.
Many years ago, I watched an old First Nations totem pole carver sharpen his best knife with a bucket of water and a long oval rock. A very humbling yet inspirational experience.