Twenty Fifteen: Lose Google Fonts, keep CSS (I need local fonts.)

Hello folks,

I’ve tried to find a solution but so far, none of them were aimed towards my “issue”. Now, I really, really love the Twenty Fifteen theme. It’s the best theme I’ve ever used and I would like to keep it. However, I am having privacy concerns because it uses Google Web fonts. I would rather keep my visitor privacy intact.

So.

I would like to download and serve all the font files locally only but keep the looks of the site intact. Is there a way I can just update the source of the font files? I’ve used local fonts before without a problem, but that was back in 2011 or so.