🚀 go-pugleaf

There's a script here <http://www.adobeforums.com/cgi-bin/webx/.3bbff5bf/1>
The version posted there first converts indd to inxx, rectifies font names, then converts back to indd, but as you need to change just the inx files, change this section of the script:

//convert Indesign files to inx
indd2inx( dir );
//change font names in the inx files
fontNameConvert( dir, fontNames );
//convert the inx files to indd
inx2indd( dir )

To read as follows (to comment out the file conversion functions)

//convert Indesign files to inx
//indd2inx( dir );
//change font names in the inx files
fontNameConvert( dir, fontNames );
//convert the inx files to indd
//inx2indd( dir )

To be on the safe side, try the script on copies of your files first.

Peter