you should be able to have lots of schlib and pcblib files in an integrated library project?
not 100% certain but it'd be fast to try.
I use a dblib now. so I just have a single DBlib file, with the separate library files in a folder structure "below" that, and the dblib file points to a database (previously excel file, now migrating to SQL) which has a record for each part, that links to the schlib and pcblib files each part in the database needs, in reference to their location from the dblib file.