For those reading this Thread and using LDMS 9.5 and loading UEFI capable devices. With Patch 228A for the HP Elitepad and other 'If you are missing the PE Menu' I have been able to load the WinPE 4 Boot WIM onto USB, modifying the STARTNET.CMD so the stick boot to pemenu. Running thru my first load now and so far so good. Can share if anyone is interested.
Regards