OK, so sorry for the wrong interpretation, Obfuscated (I'm a little bit nervous these days)... Well, unless patching the source to hardcode a new outdir path, or provide a conf dialog, or use an ini file under %appdata% (talking about Windows), I didn't found a way with the CCCC plugin.
So, I've taken a look at the other side (the CCCC one), hoping it could exist an environment variable about default outdir... But, no ! So, of course, again, I could rebuilt cccc.exe since it's open source... But, rhâaaa, not now.
Finally, awaiting a better/smarter way, I've disabled the plugin (not uninstalled, I'll be back) and added an entry in the C::B's Tools menu, launching :
"C:\Program Files (x86)\CCCC\cccc.exe" --outdir="analysis\cccc" *.h *.cpp
Of course, with ${PROJECT_DIR} as working directory.