I don't quite see why the http://wiki.inkscape.org/wiki/index.php/ExportPDFCMYK should not work for you. Both ImageMagick and UniConvertor are available for Windwos and, AFAIK, are shipped with Inkscape (not sure about ImageMagick though).
A better way, however, is importing SVG to Scribus, and printing PDF from there. Just choose "Output intended for: Printer" on the Color tab of PDF exporting dialog. And even better way involves assigning a CMYK color profile in Inkscape and setting colors from CMS tab using this profile before you import SVG into Scribus.
OK, so you want CMYK PDF after all :)
I don't quite see why the http:// wiki.inkscape. org/wiki/ index.php/ ExportPDFCMYK should not work for you. Both ImageMagick and UniConvertor are available for Windwos and, AFAIK, are shipped with Inkscape (not sure about ImageMagick though).
A better way, however, is importing SVG to Scribus, and printing PDF from there. Just choose "Output intended for: Printer" on the Color tab of PDF exporting dialog. And even better way involves assigning a CMYK color profile in Inkscape and setting colors from CMS tab using this profile before you import SVG into Scribus.