Hey there,
i love your stuff. I know Cargo is your baby Nr.1. However the Blender Asset Browser is much faster to work with, specially right now. It takes quit some time to set the kits up for the internal Asset browser. It woudln't be too much work for you to put every building and prop that contains more than one object in a collection, instead of parenting them to an empty. That way, we could easily put them in the asset browser and, if needed, press ctrl shift a to make the instance real. That way you can have the dressed building AND preserve the single objetcts.
This would speed up the process SO much! I love Cargo, but to properly work with it, the import times just hold me back from using it...
Greetings,
Paul