EdgePro for me, was the way to go, after YEARS and I'm talkin' years of free hand sharpening, which I always was fairly good at, I got the EdgePro and love it, consistent sharpening, still learning for curved blades but getting better. I still free hand sharpen when the need calls, when I'm on the road I'll bring a few small stones.
As for small slip joint folders, here is a coping blade on one of my Great Eastern Cutlerly folders I use to own, pretty small and narrow blade,
I used what looks like a tongue depressor stick as a backstop for the blade, I would tape the stick down before using the system
Provides a very cleanly made bevel, mirror polished, cuts very nicely
My one nitpic would be the frame could be a bit stronger, metal instead of plastic, I've toyed with the idea of making my own stand to make it overall more secure.
I also bought the round glass they sell that I set the rig up on, but I like that glass cooking dish, good idea!! that'll help keep the wife happy too, less mess

G2
edited to add, Nice looking edge there Powernoodle !