as chad stated thats a tall request. you are using hazers code, so I hope your not charging them for the mod, just your labor.. as for the 330 ohm resistors. you only need those for a matrix controller, and I would advise agianst trying this with a matrix.
if you use a CG controller, you use two of hazers chips, one wired CG normally, the other, pull power from a 2v source, or use resistors to restrict power supply (make it think its in a matrix controller) and use it for the face buttons. for activation you may need two switches, but I would try to wire them together so both chips are activated with one press.
this is all in therory, so good luck, let me know if it works out for you. I have been thinking of doing a similar mod, but I think I am going to use the picaxe chip. so i can control macros through the face buttons and triggers and bumpers