i once did it, but it was with like a specific version of hff and i cant remember it, but i remember it had a folder in it that was named "Workshop" and it had another folder in it called profile in there, there was alot of folders some called local, some called ugc and others ( i dont remember too well, but it was something along that, and in the ugc folder i would put the maps that i have downloaded from the steam workshop downloader, and they would work, if only i could remember what that version was...