HI, I find the topic really interesting. Let's see what reactions we have the call tomorrow re. the fontspec integration and then we can progress on the image-inlining and integrating this feature.
I have resorted to using the converter provided by the rsvg package externally and including the PDF image, so I see the room for improving the integration. Best, /PA Sagen's Paradeiser, write BE! Year 1 of the New Koprocracy