Jon,
Congratulations on your first, but I'm sure not your last, HI. I had posted about using a Lansky system for khukuris in the past. To maintain the edges that I created with the Lansky, I've used a combination of the charda, a grooved steel, and a diamond impregnated steel -- in that order -- depending on the amount of touch-up required.
I also recently received a 15" AK -- one of the "Mother of all AKs" models -- and, coincidentally, sharpened it for the first time on my 204 system just last night. Frankly, although it did put on a good edge, I'm not sure if this is really the way to go. I found it somewhat awkward to manage the large heavy blade and I was a bit fearful that it might damage the ceramic rods.
Please let us know your thoughts if you do decide to use the Spyderco system with the AK.
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Cheers,
--+Brian+--