Going S-OFF from a stock ROM, even the leak, is not difficult at all... I just did another Rezzy this last weekend and start to finish from bone stock to S-OFF with TWRP and CarbonROM installed was about an hour process. If you would like assistance in doing it let me know. I am seriously debating on building up a step-by-step guide for doing this, although finding the time to do it is the real issue, but I am sure I can assist you in doing it fairly easily. Once S-OFF is achieved, you just flash the radios in TWRP and then go into any ROM you wish.