Thanks to Mazzochi for getting this started again, but I spent some time today creating profiles for Hex on Steroids, which effectively acts as a roster editor for NBA Street Vol. 2. Both the Gamecube and PlayStation 2 versions of the players and teams database files are supported, so we can edit the files and play them on PC emulators such as Dolphin and PCSX2. There is hope that this may eventually turn into a fan-made HD remake of this classic game, but there is still plenty of planning, organizing and texture making to do before that.
In the meantime, check out this Forum thread for more information. If you are interested in helping out, or editing the files yourself, you can get the profiles from the NLSC Download Database and watch the tutorial video below on how to use them.