Probably wouldn't be to hard to code this as an 3rd party app. Just load in the tgd file, and scan it for every file it uses. After all with tg2 planetside was very kind in giving us simple xml to read.

Only hard thing I can think of is you would need to also pull model material files or something I think.... hmm..
And then once all the files were copied over into a folder, it could rewrite the tgd to have these new paths.