What tools are there to convert resp. render a SVG file to a conforming PDF/X-1a file? The tool should be able to raster filter effects at configurable resolution. It should accept user-configured CMYK colors, particularly if linked to an ICC profile, but it should make a reasonable effort to convert to CMYK where the user specified colors in RGB. FOSS would be best, but a reasonably-priced proprietary solution might be acceptable as well. Big graphics suites in excess of 100$ are not, though.
Inkscape can read a file in SVG format and save it as pdf v1.4 or v1.3 and allows a lot of possible manipulations but does not explisetly support producucing PDF/X but it can also output as Postscript, (.ps), then if you really need pdf/X you can run it through Ghostscripts ps2pdf which supports specifying -dPDFX=1 to force PDF/X-3 restrictions and also supports substituting a non-trivial Default Device Colour Space.
- Both Inkscape and GhostScript are Free (Libre and FLOSS)
- Both are Cross platform but you would probably be better off on Linux as they are better supported there.
- I am not sure about CMYK support but I am reasonably confident that it is there.