You don't need to do anything yourself. abgx360 should fix any iso automatically. Once I loaded very old ISO that was missing everything (video, dmi, pfi, ss) and abgx still fixed it automatically without any problems.
C2D E6750 @ 3.2Ghz, 4GB 800MHz DDR2 4-4-4-12, GeForce GTX 260 c216 OC 896MB, 3.2TB, Windows 7 Ultimate x64
Xbox 360 Elite, PS2 Slim, Xbox