Originally Posted by
irishguy28
If by "borrow" you mean having someone give you their Flying Blue login details, then I think you are on to a non-starter. Sharing of login details is not allowed and never a good idea. You would have to be the one to take the risk (not the "volunteer") and hope that whoever you transferred your hundreds of thousands of Amex MR points to would book the ticket that you wanted in your name.
But this is all rather academic. Very few of us think that there will ever be a redemption F seat available again for this particular flight. If you cancel your revenue booking, you probably will not end up travelling at all on this flight (unless you later buy the same seat back at a much higher price).