Not sure... I've never tried...Ive gone as far as I only leave these apps:
The reason why I remove metro apps is because you can download it from the Store later anyway. Those don't use so much space (less than 100MB combined), so I left them there. Take note that OneNote is not there, so there is no pen pairing screen when you setup the SP3 for the first time.
I have an idea. Can it boot WinPE and apply the WIM with Secure Boot disabled from the BIOS? We can activate it later anyway, right?