I don't see the sense in such a complicated procedure. Reverting back to gb is easy, you cannot brick your phone if you're not that stupid to begin with a wipe while still on ics.
There are only 2 - 3 steps to take, depending on which tool you use and whether you want to keep root or not.
Variant mobile odin, keep root:
1. Flash any gb rom, tick everroot, inject supersu, inject mobile odin
2. Flash a cf-root or custom kernel
3. Boot into cwm recovery, wipe cache, dalvik cache and data
Done
Variant pc odin keep root:
1. Flash one of the prerooted stock gb roms
2. Use the tool chainfire provides in his cf-root thread to flash the cf-root kernel
3. Boot into cwm recovery, wipe cache, dalvik cache and data
Done
4. Only necessary if you want to flash a custom kernel, transfer the kernel to your sd card, boot into cwm recovery, flash kernel
Variant pc odin without root:
1. Flash any stock gb rom using pc odin
2. Reset your device to factory defaults
What's so complicated with those procedures? No chance to brick your note (apart from the slight risk that is always there when messing with root, roms and kernels).
Sent from my Galaxy Note running ICS
