Maybe this issue is best addressed with a more comprehensive solution to large and multi-building projects in ArchiCAD? There are other problems with the multiple file approach for campus-type projects or large building projects, such as trying to keep attributes in sync between all the files.
ArchiCAD 22 (6021 USA Full), 2.5 GHz Intel Xeon W iMac Pro, 64 GB RAM, MacOS 10.14, AMD Radeon Pro Vega 64