Peter, you have provoked me to compile the installation file. In fact that you are so much wanted is quite possible. I have successfully edited install.wim of installation Win10 Home x64 en-us 1607 10.0.14393.0 (it’s RTM ESCROW of Redstone 1), adding a few files from Chuwi and replace the original one in Chuwi’s installation file. As a result, I have successfully flashed Win10 Anniversary, then install all drivers, but during the installation had to kill Android because I faced with the problem that is described in this thread. I did not have time to look for another way to work around this error, but I think at the second attempt, I will correct it.
So the method of compiling the Chuwi’s installation file is quite suitable for installation with a pure untouched install.wim