When you extract BIGBAG.DAT on PS2, you will see some files called
GUIBoot_Lara.bag
GUI_GUI_Lara.bag
GUI_Load.Lara.bag
LoadingScreens_Loading_Lara.bag
Now, there is also the same ones, but replace Lara with Ponting when you extract the file.
Just rename Ponting to Lara I would presume, and recompile, burn and it should show up as Ricky Ponting.