Thanks for the feedback.
Yes, there are several dumps floating around which are identical in ME configuration. So either they all have the same parent (bad, but could be excluded having them different versions and service tags) or they may be close to stock / unchanged (since it’s not probable that all different images had been fiddled with the same way- that was the case here)
So the proposed (cleanest) way would’ve been to take
- Re-initialize the ME of such an image according to
- Take FD/ME from this image,
- Take a stock bios region around same version of your own bios
- Transfer the DVAR block (padding between second NVRAM and first EFI volume to the stock bios - size 0x10000)
- Combine prepared stock bios and re-initialized FD/ME block to a complete image.