Gilly: Is this something you need to do regularly (like every week or every month)? If it is just for a one-time project, it is probably faster and easier to just place the 70 stories manually… it would only take an hour or so, right? Choose File > Place, then grab 10 or 15 of them in (click on one, then shift-click on the last), then click OK and they’ll all be loaded into the place cursor. Then you can click to place, or Shift-click to place-and-flow (if the story is longer than a page).
If you have to do this same thing often, though, then a script might be a good solution. (Unless there is a free or cheap script you can find. I don’t know of one.)
Another option would be to use this script:
https://www.kahrel.plus.com/indesign/place_documents.html
and then apply a paragraph style to the %%% it inserts. The paragraph style could force the text to start on a new page… and then you could use the StorySplitter script to break the threading there:
https://creativepro.com/splitting-up-threaded-stories-into-separate-frames.php#comment-1570396
(you would have to run the story script 70 times though, I think)