For that i will say probably not a good idea since we are going from android 4.2.2 to 4.3 it may work but could result in allot of FC's. I will try and report when i post the build.
does wiui v4EX have the miui updater app in it. If so you can reflash the CWM zip from it. If not you will have to use fastboot.
What model do you have and what method are you using to flash?
Will look into that. Also went home at lunch time and started CM10.1 build. it will be posted when i get home which is in about 4h. Then i will start updating my repos to build cm-10.2 and AOKP-jb_mr2