Maybe I misunderstand the issue or problem.
If you're happy with Win 2008 R2, you might want to look into software spawned initially to replace "drive extender" on Win Home Server v.1 when WHS-2011 was released (based on 2008 R2).
When it was announced that WHS-2011 would die without heirs, the add-in programmers probably already had their strategy in mind: support WHS-2011, Win Server 2008 R2, and all the later server OS's.
So, for instance, StableBit now comes in versions that also include applying the "drive-pool" concept to Win 7 and Win 8 as well as Server 2012, Essentials, SBS and WHS-2011.
If you ever thought that RAID left you "blind" when trying to recover an array, StableBit doesn't. Further, you can jump back and forth between StableBit v 1 and v 2 without mishap -- it is all managed quite well, and I proved it this last week. Even if drive labeling is inconsistent after an OS reinstall, either version of Stablebit will rebuild the drive pool without a hitch and without regard to what the drives were labeled before and after. (I also proved that in the last week or so.)
The price? Depends on your use. But I think you're talking about $25 or so, and the license will extend to the same hardware with changes that may even include processor replacement.
During these "tribulations" I mentioned obliquely, I bricked a good WHS server install on an SSD; then I bricked the HDD from which the SSD had been cloned; and then I bricked a drive image made with Acronis TM of that HDD. I finally just reinstalled the server OS from scratch.
But there was no problem with the data drive pool array. I had selected certain folders to be auto-duplicated by StableBit, but the duplication wasn't necessary for the current crisis. Moreover, both the old version and the new one recognized the selective folder duplication! They swiftly re-balanced the allocation between disks, and all was wonderful.
Also, you may be interested in "StableBit Scanner" which is a SMART monitoring and analysis software for all disks on your system, only including the drive pool array. Another $25.