I had heard about the Heretic one (HHE), but I never knew there was one for Hexen.
Perhaps the reason no source ports support these is because the files they create are binary files instead of text files. I have experience with the early DEHACKED binary files, and the EDGE source port could load them, but they would be a pain to support since they are just the raw structures dumped into a file, and all the source ports (even conservate ones) have extended their structures (mobj_t in particular).