it's definitely not a supported config: https://support.google.com/analytics/answer/1032389?hl=en

But you can download it, and host it locally. Just update it periodically. As you can see from the changelog, it only changes every few months: https://developers.google.com/analytics/devguides/collection...

Google actually takes a few days to deploy updates to all of their servers. So a daily script to update it on your server would be fine.

You could probably proxy a file through your own server and add any headers you like. But in that case browser cannot use a version of a script cached at other sites.