Some have discussed keeping hands off completely in the period immediately after the A/P disconnected and the switch to Alt 2b law.
Just a personal opinion, but that course would have a high probability of ending in a spiral dive. There is nothing to level the wings in Alt 2b but the aircraft's natural roll stability (which isn't all that good in most jets).
Bonin had to get on the stick, but only in roll, and not with such a heavy hand. If he had used a gentle touch in roll and stayed off the pitch axis, AF447 would have ended in Paris.
The problem was that Bonin had never seen that control configuration in training and so used a highly inappropriate control technique which appears to have generated a roll PIO.