Assets: rewrite inlined CSS file

Hi there,

i want to inline a CSS file which contains relative references to some font files. Side not: i cannot change these relative URLs inside the CSS file.

The problem is if i inline the file with {% do assets.addCss('theme://assets/iconfont/iconfont.css', {'loading': 'inline'}) %} the references are obviously not working anymore.

I saw that the pipeline is able to rewrite URLs in CSS files. But if i activate the pipeline, the CSS file gets bundled and loaded through a link so it is not inlined anymore.

Is there a way to inline the CSS and rewrite the URLs?

Thanks a lot.

Folderstructure of CSS file with fonts