I quite understand that: or in my case, "it should be possible to do this".

Unpacking and repacking the DV2 files is reasonably straightforward, I'd just need to dig out the correct tool to do it (not least since the format changed between ED and DKS) but doing anything useful with the contents is less so. I have slightly disturbing memories of cutting and pasting bits of NIF-based meshes between D2's format and Fallout 3's (at least I think that's how I got Blender to read and write stuff, though I also have a vague memory of rewriting a chunk of its NIF import script) and what was worse was finding that textures were also stored as NIFs, which required some contrivance to work with.
I'd hazard a guess that anything that's a more key part of the game may be even nastier to work with, and suspect that a lot of configuration stuff was coded into the executable anyway.