[itsme]

With Sciurius' MSPro Tools https://github.com/sciurius/MSPro-Tools you might be able to do what you want. It's a packet of Perl scripts for a number of useful tasks.
With get_meta.pl you can read all meta data out of the MobileSheets database into a .JSON file. Then you can manipulate this .JSON export with any text editor, apply search & replace actions as required and reimport it into the MobileSheets database with upd_meta.pl.
I used MSPro Tools several times successfully. Maybe it needs an update to handle the new database format, but that should not be problem as Sciurius is very active, kind and cooperative.