Sorry to hear of the medical problems that you & spouse experience. I hope for the best possible outcomes.
(1) OK. If Windows Defender says it is in charge, that will likely be good enough to believe BitDefender is not the cause of BCDEdit's inability to read the BCD when "/Store" is not used.
(2) If you've only got two internal SSDs, let them alone. That will be OK.
(3)
(a) Your last List Disk showed 17 drives plugged in. The first 11 had the asterisk & were GPT, that includes the most important ones, Disk 0 & Disk 1, which are internal.
(b) Are you & spouse unable to unplug all the external USB hard drives & flash drives? Doing so will prevent BIOS looking to them for a boot device. I didn't see an EFI on them, but MSInfo32 continues to have a HarddiskVolume number too high for it to be on Disk 0 (which is where it belongs). You should definitely have them unplugged when creating & populating a new EFI.
(4) I'd still like you to put a letter back onto the EFI of Disk 0, then try "/Store"...
DiskPart <<<Enter DiskPart
List Vol <<<List volumes & letters
Select Disk 0 <<<Focus on Disk 0
Select Part 2 <<<Select partition 2 -- looks like EFI
Assign Letter=S <<<Give it letter S
List Vol <<<Should see the new letter now
Exit <<<Leave DiskPart
BCDEdit /Store S:\EFI\Microsoft\Boot\BCD /Enum All
Show us that output. Your last List Vol looked like...
DISKPART> list vol
Volume ### Ltr Label Fs Type Size Status Info
Volume 0 J DVD-ROM 0 B No Media
Volume 1 C BOOT DISK C NTFS Partition 930 GB Healthy Boot
Volume 2 NTFS Partition 589 MB Healthy
Volume 3 NO NAME FAT32 Partition 100 MB Healthy System
Volume 3 is FAT32, 100 MB & System. That is EFI. It would be nice to see that -- by putting letter S where we did (Disk 0, Part 2) -- it also shows up on Volume 3. But, then, MSInfo32 should be showing HarddiskVolume2. That's still a puzzle!
(4) It might be best to continue with Ramesh to make a Macrium system image. Then, try the article he suggested to fix your EFI. I think that should work. Afterward, we can make a final decision as to whether you should have an MSR & whether EFI should be the first partition on Disk 0. I can talk you through AOMEI, if you decide to do it.