I’m using Linux Libertine to typeset the translation of a poem with eledmac/eledpar. The original text appears on the left pages and the translation on the right ones. Since the translated verses are longer then the original once it happens often that a single word of the translated verse breaks in a new line. This is ok, but I thought about scaling the font of the translated font slightly in the vertical direction to create a poor man’s condensed version of Libertine.
I know that this is not the best way but I want at least see if it looks that bad.
\documentclass[parskip=full]{scrartcl}
\usepackage{libertine}
\usepackage{geometry}
\geometry{showframe,textwidth=70mm}
\begin{document}
This is a text that is a little to long for this line.
\addfontfeatures{Scale=0.965}
This is a text that is a little to long for this line.
\end{document}

I’m aware of fontspec’s Width option, but it won’t work for Libertine and Scale affects width and height.
All solutions taking an argument (e.g. \scalebox) wont work here, because I can’t wrap all verses in such a macro. So I need a switch like \addfontfeature or something else.
