Could you expand on why you need a image with a kernel? I rooted my nexus 4 by unlocking the boot loader, installing cm recovery, and flashing a zip that just contains superuser and busybox binaries. Is there a key difference with Google glass?
The critical step is "installing cm recovery": ClockwordMod is an image that you can boot, and which you chose to flash to your recovery partition (which is how most guides recommend you proceed, so you can easily access it while on the go; you don't actually need to do this: you can just boot it from RAM using "fastboot boot"). To make a working copy of ClockwordMod (or any similarly custom recovery), you will need to be able to build or dump a kernel for that device.
