That's a start, but it doesn't work. Dblatex 0.2.12 calls inkscape with the wrong parameters:
E.g. if the file in the document is named images/foo.svg the call is:
inkscape -z -D "--export-pdf=/complete/path/to/images/foo.svg" fig2.pdf
Tt should be:
inkscape -z -D "/complete/path/to/images/foo.svg" --export-pdf=fig2.pdf
Also, I'd prefer -C (canvas) instead of -D (drawing), because I normally...