Reduce collection instance detail

I have a scene where I instance a collection from another scene, several times.
The collection is a whole typical unit house, with all it’s detail, all furnishings.
For the purpose of the scene in question I want to simplify the content, keep walls and basic massing of the building and remove detail
The furnishings are in a separate collection, under the unit building collection.
How can I remove the furnishings in the instances of the unit building collection?

Would it be problematic to separate the collections in the original file?

Or what about actually appending the collections to the current scene so they can be modified? You can instance a collection from the current scene, so that would surely work.