Replace the unattend.xml on the OEM windows 8 to skip the oobe screens?

hi, we've just received 50 venue pro 11, we plan to use them with the default and already installed windows 8 pro (we'll join our domain, install the sccm 2012 client and from there run a task sequence to install missing required applications and other stuff)

now I'd like to skip every (or most of) screens at the start, where you have to choose your region, timezone, create an account etc etc (yes we can still tick and accept the licence agreement if required) my idea would be to boot the tablet from winPe, and copy a modified version of an answer file to c:\windows\panther\ (I'll replace the unattend.xml) and reboot.

Has anyone already tried this? any advice or problem (or best a sample of a working unattend.xml?)

If not do you think of any problem that could occur? Or maybe it didn't work at all (could you explain why?)

I don't want to spend too much time trying this, (or I'll do it faster manually), that's why I'm asking for your experience regarding this.

Thanks a lot!