huh... just typed this all up and it dissapeared when i pressed submit
the one thing i wish i had done more then anything in my knife buying so far was buy the pro model of the edgepro system. and if i had a lot of extra money at the moment, i would do it in a heart beat.
it really is an amazing system for putting a striaght bevel on a knife, as well as a finished edge. if you want to do a convex edge, you pretty much have to put several bevels on it (40, 35, 30, 28, 24, 21) and then smooth it out with sand paper.
i have done several of my khukuries with it, including an 18" ang knola and a 20" sirupati. you have to work with them though, as the blade gemoetry doesnt allow you to keep a consistent edge angle, the curve and tip being thicker then the sweet spot. on my 20" siru, the tip and curve were around 45-50 degrees where as the sweet spot was 24. any more acute at the curve would have meant that i would have been seriously digging into the main grind, creating an edge bevel that was something like an inch wide.
i feel confident that i could put a consistent bevel on my 44" gelbu special style monster khukuri, but it would be a constant struggle to keep it stable. when it gets near the curve, you have to rest the blade in the crook of your arm, same for the tip area. youd pretty much have to set up books to keep the handle/tip elevated and level when sharpening the extreme ends of the edge.
its difficult, but it gives you a very consisten edge. being able to sharpen a khukuri withough a sharpening system is a valueable skill to have though, as with all other knife styles