I had the same issue with a client. But the problem was there were 120+ CSS files contained the media queries. So what I did is, set the viewport width. I have used this snippet on that site and working fine. Using this, even you can give the option for the users to toggle between responsive design and non-responsive design.
$(document).ready(function(){
$('meta[name="viewport"]').prop('content', 'width=1440');
});
Note: 1440 is your preferred screen width.
Hope this helps 🙂