Diskless ECCp has been done, however not by me, and only on a case by case basis. I'm guessing it would be difficult if not impossible to make a general release disk because of all the drivers that would be necessary. I believe that is why klinux has different release versions.
That being said, RC has had success by modifying the trinux distribution, so you may want to check out trinux. I don't know the size of the Dnet client as compared to the ECCp CLI client and supporting files, so I can't say how easy it would be to modify klinux.