Just managed to setup a tiny/simple privacy-friendly analytics system.

You basically call an api from your backend with the api key and all the headers you received from the browser (php and Apache or nginx in my case) and the analytics api gets useful stuff out of that data without sacrificing privacy.

I get a little bit more insight into my websites usage and the client isn't sacrificing identifiable information!

I've been wanting to make this fucker for fucking months.