Good news. The Font Awesome project's founder responded at speed of light to my request and now he plans to release the icon set under the LGPL within a month or so, making the icons as accessible for reuse as the default Oxygen set.
After that the "only" remaining matters would be adaptation to KDE and artistic vision. Here's a mockup of how KWrite's look could be transformed. Original:
To make it play more right I also reworked the Oxygen style quite a bit. Nearly no gradients or shines, post-Vista aesthetics inspired by web and mobile UIs where contrast is king. "Awesome" style:
Last week fri13 commented: "Monochrome icons are terrible from usability standpoint. They don't offer at all same information as colorful skeuomophisim icons."
Whoa about the colorizing the icons to give benefits of color coding?