A batch script with opening each scene is easy. You could run it at night ? Without loading, i'm not sure. Maybe with get/setMAXFileAssetMetadata but looks like it's for updating nodes and not adding anything new. User Spacefrog might have ideas.
There's a maxscript function called mergeMaxFile that does this (from a quick search any way). So you can just write a script that collects your max files, then merges that scene into them all.
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Without loading, i'm not sure.
Maybe with get/setMAXFileAssetMetadata but looks like it's for updating nodes and not adding anything new.
User Spacefrog might have ideas.