I had an issue a while ago with one of my SFS partitions, and I was reluctant, initially, to go down the 'repair' option method ... BUT when I did decide to take the 'repair' route it took only a few minutes of disk correction and the HDD file structure was as it was before, and has worked OK ever since.

So, if there is no other way of fixing/repairing it ......... what else have you got to lose? So, IMHO .. I'd give it a try to repair the SFS file structure, and you may end up being pleasantly surprised ........ well I hope so.

As long as you are sure you have tried any/every other alternative to recover the HDD structure already.