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Upgrading should work fine, because the partition is already there. I haven't tried this, though. Having a TM backup is a good idea anyway!

So if I understood correctly, you did not use the Sierra installer at all, but you had to create the recovery/boot partition yourself, and after the Time Machine restore, the recovery/boot partition was correctly filled?

Interesting. How did you restore your HDD to the Fusion Drive? CCC or Disk Utility?

Currently, there is no direct way to install High Sierra on a newly created Fusion Drive. Basically, the installer forgets to create the Recovery Partition on the HDD of the Fusion Drive, rendering the system unable to boot after copying the installation files to disk. Clover comes up empty...