I tried using the boot.wim from the rescue_disk.iso that I made. The USB drive then booted to PE but gave a missing dll error.
I then updated the three missing dll’s and one 0 byte length dll with the dll’s from the ISO.
Now the USB drive boots to the WinPE desktop but I get a

‘aswShMin.exe - No Disk’ dialogue box, saying ‘There is no disk in the drive, please insert a disk into drive A:’.

This is now the same message that I get if I boot from the rescue_disk.iso file from a USB boot drive using grub4dos.

So no solution… :frowning: