Recently I booked a TB2 award using points . I noticed today that the points required when down and called up B6 to see if I could get I credit . The answer was yes ^^ with no charge so they would cancel my itinerary and I could rebook . I got an error while rebooking (this may be a Sabre issue) (they may have not recognized the cancellation yet (even though the points were back in my account) ). It took another 5 minute phone call (no big deal) and I am back on the flight . All in all it was worth the 15 minutes of calls to save the points.
So if anyone else this thinking of doing this it can be done (just allow time for multiple phone calls) .