I seriously doubt it can be automated.
Have you had a look at the scripts? They may be straightforward and can be recreated manually in a few hours. I guess it's possible they are vastly overcomplicated though, and may need some real work.
I would suggest you get hold of ALL the scripts from the users. Then pull them up one at a time in Rumba so you can make a real estimate of the effort involved. Watch out for things that won't translate between the two scripting languages. Don't just say "this one has 10 lines, that one has 100 lines..." you have to ACTUALLY LOOK AT THE CODE!
Once you've done that, have the users sign something that says they have provided all of the scripts. This won't help you much, but it will relieve that pressure that happens when someone remembers that scripts from accounting that runs for three days at the end of each quarter. When they remember it, you get to renegotiate the release date because of the previous document. That will let you keep your head down and keep coding.