Just rename the kernel u want to flash to boot.img and put it in the root of the zip and ur flashable zip is ready.
It's handy if u want to test kernels without PC.
Its tested with XM dual,
If u want to check if its workung for XM single just use root explorer and head to dev/block/platform/msm_sdcc.1/by-name and look for boot
If boot is shortcut to mmcblk0p17 then it will work
If not change the updater-script in the zip with the right one
See the attached pic
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