I think I can recall John Hall saying you can, but I wouldn't trust my memory on that.
I have a '79 4001, and I'll likely need a new rod at some point (a previous owner...

), so I'm interested to see how this turns out for you.
If I get a few minutes, I'll peruse the forums and see if I can come up with anything.
EDIT: I just thought of something. If you have the old rod in your possession, why not take it to a local luthier? That style rod is used in some acoustic guitars, so I don't know why someone local with acoustic guitar experience couldn't make one for you.