If this is useful to anyone I managed to install this drive in an otherwise dead MBL using the second unbrick procedure using the 3TB image and then expanding it to 8TiB using the partition editor in Parted magic.
The only extra step was that before the resize the partition editor needed to do an automatic fix on the GPT. And the resize took about 15 minutes..
So I'm guessing if this works then *any* HDD works..
These disks are super cheap. They have issues with write performance but I use my MBL as an online media server so basically this is write once. The only issue is now the super slow ethernet performance 60Mbs tops :-( It's going to take a while to fill…