Yes, sort of. :) It's not exactly a utility, but if you have the full version of Kontakt 6, you can use the Kontakt Creator Tools to export out your mappings. I made a video about that process here. The LUA converter script I used in that video can be found here.
This process will get most of the way towards having a functional DS instrument. You will, of course, have to build the Decent Sampler UI yourself. There is documentation for that here.
Besides the documentation, the best way to learn how do make Decent Sampler instruments is to download a few of them and peek inside their dspreset files. Seeing how other people have handled things is always helpful.