[Q] enable vanilla UI on EMUI/SENSE/XPERIA/TOUCHWIZZ

Is the aosp, vanilla android systemUI inside the source of all this OEM userInterfaces like HTC-Sense, TouchWiz, EMUI . . . ?

Well I have a honor 4x.
I tried to mod the systemUI.apk a little bit. I noticed something very interesting:
in the "layout" folder it seems every XML is existing twice!
for example the statusbar, there are two files: statusbar**.xml -> the default, vanilla, aosp resource AND statusbar**HUAWEI-CRAP.xml -> resource for the EMUI statusbar

My guess: all the aosp-files exist, they just arent enabled or something....

so I think, there has to be a file or somthing, saying to the android system "hey, don't use the vanilla statusbar.xml, use the crappy EMUI.statusbar.xml instead!"
Does this exist?
Can I change it?
If the AOSP-things are in the layout folder, can I delete all this HUAWEI-**** in order to enable the stock UI?
I want the stock-nexus-aosp-vanilla-android userinterface... I am running the EMUI stockrom, but i am rooted and can change everything.
How to enable the AOSP-UI?

My english is bad, but i hope you get what i want to know :)
thank you!