Hi! There are not unfortunately any readily form-fillable versions of the PDFs, nor are there any spreadsheets or anything similar, at least as far as I know.
If you have to play digitally, my advice would be to either import the PDFs as Google images and edit them directly, or just use a simple shared document—Fax characters aren't all that complicated, fortunately, so they're relatively easy to track.
Sorry again, though.