Nice idea RimRocka...
Have you read the "Customization guide" for NBA Live 2003 found on the front page of the NLSC? The way it sounds is this year there will be no need to use GFXPAK for installing graphics addons...thus making installing and removing addons much easier.
All you have to do is edit the last line of the \NBA Live 2003\main\cscripts\xstartup.cfg file to read
customart 1
Next you create a directory in the render directory called "xcommon" and inside this directory you place the 2 FSH and 3 .O files that you included with your patch.
I did a quick 2 minute test of this with your patch and it seemed to work...but I'll leave it up to you to decide whether you want to take this option any further...
