Well, this is just wild speculation, but like vodo40k said, I would doubt that "reaperfied" beings can somehow be reverted back to their natural state. In some cases, they've been ripped apart and reassembled; all a Brute has from a Turian is half a head. The person they have been - their collection of memories and behaviorial engrams - all depended on a specific combination of biochemicals and electric pulses, which I assume would have been irrevocably altered during the conversion process (these guys are literally half-rotten!).
As for "control" ... I suppose this depends on how Husks etc are networked with Reapers, meaning if they are actively dominated by some sort of signal or whether they are simply following a program that has been implanted into whatever is left of their mind via indoctrination. I'd say it is possible that Husks etc could just as well simply get "cut off" and continue functioning on an "instinctive" basis, like proper zombies. On the other hand, we've seen them being capable of following some protocols more advanced than "charge in and kill" (namely: taking prisoners and dragging them to collection camps), which might imply direct guidance from a Reaper. If said guidance exists in any form, it would be under Shep's control after he/she had made this choice.
Just let them jump off a cliff or something.