Looking for Scripts that Replaces Text and Master Pages

100 is a small enough number that no time may be saved writing a script (assuming none exist for the purpose).

I'd be tempted to ...

1. Create a sourcing file that has the new MPs needed (and safe versions of MPs "Left" and "Right")
2. Create a new Book file.
3. Add to it all 100 of the files needing update (this is the only tedious part).
4. Use Find/Replace from the Book menu to fix the text string.
5. Select all book component files:
   File > Import > Formats
   Import from Document [MPsourcefilename.fm]
   [Deselect All]
   
6. Page Layouts
   [Import]

Well found out that I miss other batches in the FrameMaker world.

Relink images in multiple files to a new folder. (These are missing due to a name change of the folder.)

Converts all framemaker files in a specific folder to PDFs, with the same name of its origin FM file.