I think I was able to make a zip but ran into a brick wall trying to test. Wasn't able to upgrade to 4.4.3, so tried to side load my zip I created and that failed also. Will fool with it again tomorrow, unless someone that knows what they are doing is kind enough to help you out. I'm sure it pretty simple if you know what you are doing.
You have to get the zip options correct (store not compress, and maybe something else?) or it wont open in recovery[COLOR="Silver"]
---------- Post added at 05:17 PM ---------- Previous post was at 04:43 PM ----------
I'm uploading a 4.4.2 zip that only has /system in it. none of the other partitions or the patch for the bootloader/recovery as you are already on the newest ones of these. I think this is the safest way to flash back to 4.4.2, but I think it may break OTAs if they are patch based like the 4.4.3 one was.