Really it started as a total conversion, But I think it might end up being a mini mod, as I'm doing it by myself.
Really, making a patchfile isn't hard. I'm assuming you have WinRFA? You just extract the ObjectSpawnTemplates.con and if you want the ObjectTemplates.con (?) to your desktop. (thats what I do) then pack that file, it will be named BfVietnam as "mapname_001.rfa
Then just edit the patch file.
If you make another patch called _002 with the same files it will overwrite your previous work though. So be careful, and always back up your BFV files, until you get really good at it like me