(1) Yes, bring back Intelpep.sys. Do the DIR to be sure it's still C:...
*DIR C:* <<<Should show Windows, Users, & Program Files folders
DEL C:\Windows\System32\drivers\intelpep.sys
REN C:\Windows\System32\drivers\intelpep.sys.bak intelpep.sys
(2) You got a different error message the first time you tried to boot after disabling signature enforcement (which BTW was temporary & just lasted for that one boot). It just said it couldn't boot after multiple attempts & never mentioned Intelpep.sys. So maybe Intelpep.sys is fine. Windows could be just struggling for a reason to give & comes up with Intelpep,sys when enforcement is on. Let's try BCDBoot again but add the Format that Megahertz mentioned in the other thread. Doing so likely will clear up that horror show going on in your <fwbootmgr>. The BCD really will be new this time.
DiskPart <<<Enter DiskPart
List Vol <<<Show the drive letters
>>Presuming Windows is still C: & EFI still Volume 1....
>>Volume ### Ltr Label Fs Type Size Status Info
>>------------- --- ---------- ------ ------------- --------- --------- --------
>>Volume 0 C System NTFS Partition 930 GB Healthy <<<Windows
>>Volume 1 FAT32 Partition 100 MB Healthy Hidden <<<EFI
>>Volume 2 D NTFS Partition 502 MB Healthy Hidden <<<Recovery
>>Volume 3 E USB DISK FAT32 Removable 57 GB Healthy
Select Volume 1 <<<Select EFI ****
Format Quick FS=fat32 Label="EFI" <<<Wipe it & label it
Assign Letter=S <<<Give it letter S
GPT ATTRIBUTES=0x8000000000000000 <<<Give it right Attrib
Exit <<<Leave DiskPart
BCDBoot C:\Windows /s S: /f UEFI
DiskPart <<<Enter DiskPart
Select Vol=S <<<Select EFI
Remove Letter=S <<<Remove the letter
Exit <<<Exit DiskPart
Try to boot to Windows. I hope it will go.