Downgrade jb kernel to ics kernel on hboot 1.19 s-on possible?

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http://forum.xda-developers.com – I'm currentrly running jelly bean stock rooted odex ROM with HBOOT 1.19 S-ON I flashed the PJ75IMG - STOCK KERNEL(the one w/ the new hboot) My radio and kernel version can be seen on the pic below. I triee to S-OFF my phone through dirtyracun method but it failed when flashing RUU due to my kernel version not supported so I need to downgrade it. I heard people saying downgrading would result in a brick, is that also true for downgrading kernel? I also cannot find stock kernel for ICS, where could u possibly download it and what method should I do to successfully flash it? Sent from my (HowTos)