I have switched to convex edge blades. I use a leather strop, and occasionally fine (800-1500) sandpaper. I've seen some altoids cans made into portable sharpners and I just scored me a new altoids can so I am going to make one and try it out. I'm concerned it might be too short.

But no matter, a piece of cardboard loaded with stropping compound, a leather belt, fine sandpaper, your pantlet, all can be used to strop the convex edge.