btw in my experiment, I got an error about C:\DSPdsblr.exe not being found
That's a common problem. I recommend using the OEMPreinstall Folder ($OEM$\$1) to get around that. Just go into the bin and find DPsFnshr.7z - you can find all of the files you'd need to put in the preinstall folder inside this archive. Then just run a cleanup command script at the end that deletes everything you don't want/need.