Large email.css file is causing customer emails to be clipped in Gmail

By default, email templates include "css/email.css", which I believe is generated by Weltpixel. The problem? Well, this file alone is 122KB. When combined with the rest of our actual email templates, the sizes of them range from 150-200KB. This is problematic because Gmail will "clip" emails that are over a certain size.

It looks like the email.css file contains *all* styles in the theme, not just what is being used in the emails themselves. Is there a way we can reduce the number of styles that are added to this file? If we can't do that, is there some way to have that file minified as part of the less generation process?

Thanks.