Apply unattend.xml to offline image

I have a wim image from a sysprepped client. This image I've been using so far to deploy Windows 8.1.

Because I did not get my uefi client to boot in uefi mode I decided to give this procedure a try:

1. I PXE boot my Client in bios mode
2. I would prepare my uefi partitions with diskpart
3. Then I would apply my efi and my install image to the right partitions
4. I switch my client from bios to uefi and restart it
   
   The client boots and starts windows setup ok.

Now I would like to use the same unattend.xml which has been working with wds.

I tried dism.exe /apply-unattend but when I boot my client I'm prompted for everything. No drivers installed, no language settings, nothing.