Hi,
Welcome 
It’s always the way that the first simple thing you want to do… it turns out to be a pain…!
Here is a link to some custom code that was written to hide a Layer in a linked dwg…
This shows what you need to plug into it…
I obviously don’t know what your abilities are in Python, but if you have a lot of DWGs you’ll want to edit the code to iterate through them.
Hope that helps,
Mark
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