What type of steels do you need to sharpen? Are these smaller pocket knives or do you want to also sharpen larger kitchen knives or large fixed blade hunting/outdoors knives?
In the field, do you just want to be able to touch up already-sharp knives, or do you need to be able to repair damaged edges and set fresh bevels?
What kind of edge are you trying to achieve? Good working edge, more refined edge, or mirror polished edge?
In general you are going to need something coarse that can cut your particular steels for edge repair and bevel setting. The DMT coarse covers a lot of that. Assuming your technique is good, you can get a functional edge off of nothing but the DMT, and just need a method of removing the burr, which you can do on the DMT if you know how.
After you have your basic coarse edge established off the DMT, the King would cover you for your medium and fine abrasives for edge refinement, assuming it works with your steels.
You need a method of flattening the king stones every so often, and the DMT coarse isn't recommended for water stone flattening. A strop of some kind might help with burr removal and edge burnishing, though you can strop on the King 6000 if you don't want something else. I get good results using a balsa strop with some 1 micron diamond spray.
So depending on what you are trying to do, you may already have pretty much what you need. There are lots and lots of other options, of course, depending on how much you want to spend and what range of steels you want to be able to sharpen.