You'll need to decompile the script files out of the nss.npa, find the precise script file to modify and then recompile the whole thing.
To do so, you'll need the Nipa2 Tools that... are probably somewhere in this thread or that someone else has, don't ask me.. I don't have them anymore.
I don't specifically remember the command line to compile/decompile but it should come with a read me file that can help with this. (Alternatively, you can open the batch file of my patch and look for the nipa2 command lines for the CG Files, it should be the same as for the scripts.)
If you can't find the files on your own, I'll try to find them for you once I get back home. (Might also throw in a concise explanation as to how-to use it if I figure it out again)