HerrKaputt - did you ever get a response to your email to GOG?
I think I could put together some formal emails/letters to the relevant parties. I think the previous email sent to GOG, if it hasn't received a reply, might have been too informal and easily dismissed by them. If we could get some commitment from the experienced modders on here to put their name against it, then we could add some weight to our case.
I don't see any reason at this point why the code shouldn't be released, and if we can show that by releasing it we will improve the game, then it might convince them to agree with us.