You answered before you read what you were answering? *facepalm*
I eventually gave up on the problem.
The work around I used was to print the file and physically cut the document and then rescan it. Fortunately OCR and printing technology makes that possible though it was a dreadful waste of paper.
If you find something please do post here what is found, I'd like to have the option even if my need is no longer pressing.