Did you mean for the rest of the flight?
I interpreted the line "in case of manual action on the hand wheel," meaning only whilst the hand holds the trim wheel.
Manual trim overrides autotrim (micro-switches disconnect the auto-drive if I remember correctly) for the duration of manual input... hold the trim wheel or move it and that prevents autotrim - the computers monitor the trim state during manual trim and on manual 'release', the computer reacquires control from where the manual inputs left off.
So let's assume PF realizes he has inadvertently driven the trim to +13NU due to his excessive NU elevator demands - all he has to do is twiddle the trim wheel ND to something he likes (let's say +3NU) and let go. The trim will remain at or about +3NU unless he starts waving the SS in a nose up position for a long enough to cause the lagged THS autotrim to decide that the PF really wants more NU. To be honest it doesn't seem at all evil or that hard to understand, so long as you are half-aware of the systems of your aircraft - you know the one you are qualified to fly.