Moving qubes to another drive, in preparation for cache

[motech man]

My system has a 120GB SSD and a 2TB HDD, and the HDD is totally empty now.

I want to use most of the SSD as a cache for the HDD according to https://groups.google.com/forum/#!msg/qubes-users/ArHTEeQAH8A/r9zzY0DLBQAJ, but qubes resides entirely on the SSD.

I have made a disk image of the SSD with Macrium Reflect. Can I restore that image onto the HDD, boot the Qubes 3.2 installer from USB or DVD, and fix change fstab to mount the HDD device instead of the SDD?

What other places need to be fixed? Are there other problems that lock the installation to the SSD I need to resolve (if even possible)?

I also have enough RAM to hold the entire filesystem, if that is any help in this migration process.