You can already do this, and it will work just as in FSX. Even without the add-on linker.
Head to your “content.xml” which is located (at least in my case) at “AppData\Roaming\Microsoft Flight Simulator”. Open it with the notepad and use serach option to find the add-on you need and then change “active=true” to “active=false” and it will disable the add-on from loading even without uninstalling it.
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