Allright, for everyone who has end-users requesting minimal changes to your page, check this out:

Below is a simple widget you can place on your page to add scoped CSS to your page, or layout elements in a fashion that is 100% in line with the page-builder philosophy and is very maintainable.

Dummy example implementation:

Works out:

The widget package can be downloaded here, the source can be found here.

Enjoy!