Hi takata,
When trim is activated manually, autotrim is frozen, can't displace anything anymore.
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.
elevators are not used to replace THS trim
How does the system cope with stab frozen then, either due to relevant double hydraulic loss, or if the stab trim wheel is held stationary by hand?