I did just fine on my black CQC7, but of course it doesn't have the recurve problem. A flat DMT sharpener, then follow up with no more than a few strokes on the back side with a very fine creamic rod. The important thing is to not put too much pressure on the blade because that only adds more burr to get rid of on the backside, and with a chisel grind you want as little of that as possible.
The less sharpening you have to do on the backside, the more OK it is to do it at the same angle and still preserve most of the edge angle you get from the un-beveled back. And that also means a better-looking backside with the coating going as close to the edge as possible. If you have to remove a large burr, that is going to give you more uncoated area.
With the thickness of Emerson blades, I recommend a good coarse diamond stone so you can remove adequate metal without taking a frustrating long time. I used a blue DMT, which I think is actually "medium" but still very agressive when new, and I got a really good biting edge by using it only on the sharpened side, and only a fine ceramic rod on the backside. It didn't shave as neatly as a blade sharpened down to a fine grit on both sides, but with just a short drag on various materials it would actually slice through faster.
The rods work good on the commander's recurve blade. Aside from that, I would try a diamond rod as suggested on ernie's website.