I've not done it myself, but I'm pretty sure you can configure Cookie AutoDelete or similar extensions to block everything except specific cookies for any given domain. I don't think you could accomplish it with just a file saved locally, the browser isn't generally able to read local files without using an extension.
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i do something like this on firefox and the container tabs feature.
i create a set of container tabs for websites that do tracking with cookies and only visit that website using its dedicated container so that it looks like i ONLY use my browser to go to ONLY go to that one website from the trackers perspective.
i also started using privacy badger and ghostery to give the tracker junk information to make all the data harvesting useless; but i don't know if it works yet.
Can you force the browser to send a cookie header to the DuckDuckGo website? I think there are plugins that add headers to specific websites.
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