Embed fonts when converting to pdf from the command line

Hi,

How can I tell LO to embed fonts when converting a doc to pdf from the command line?
I’m using LO 3.5.7.2 on ubuntu 12.04

The command I’m using to convert docs to pdf is:

libreoffice --headless -–invisible --convert-to pdf:writer_pdf_Export --outdir out test.odf

The config option I need is explained here:
Embed_standard_fonts

When I Set the option manually through the GUI the registrymodifications.xcu file gets the following item:
/home/someuser/.config/libreoffice/3/user/registrymodifications.xcu

<item oor:path="/org.openoffice.Office.Common/Filter/PDF/Export"><prop oor:name="EmbedStandardFonts" oor:op="fuse"><value>true</value></prop></item>

Is there a global config file I can edit to add the above xml item?
Do I need to add a config file manually to set this?
I’m converting docs on a server with no GUI installed.
The user has home dir under /var/lib/myuser/

On LibreOffice 4.2 all the fonts are embedded in the pdf but I need a fix for 3.5
Always embed 14 standard Postscript fonts in PDF

Thanks

LibreOffice 4.2 is stable now so this issue doesn’t matter any more.