OP seeing the responses here, they cluster into 2 groups: freehand stones (including the 3 suggested in my linked reviews), and guided field sharpeners. Of the ones I suggested, my favorite for non super-steels is the Arctic Fox. If using super steels like s30v or anything with higher vanadium content, I prefer the DMT diafold.
From your comment, wonder if you are looking only for a guided sharpener. If you do that, good idea to confirm that the angle options on the field sharpener are compatible with those of your Sharpmaker (15 and 20 dps).
If you are willing to consider learning freehand, that is worth doing for a field sharpener. It is a bit more versatile (you can sharpen to any angle you want), and of course, smaller to carry. Sharpening those folders you mention by freehanding on a small stone is actually slightly easier to learn than freehanding on a bench stone (at least, it was for me). It may be because with a pocket/field stone, you are not going such a large distance on the stone, you can slightly more easily see and control what's going on with your edge angle with each stroke you make. In any case, if willing to go freehand, I'd highly recommend that option, get one of the excellent freehand sharpeners folks have suggested in the thread, take a beater knife or three and practice till you can hold an edge angle. It should be totally do-able.