I'm surprised that no-one has raised the point of first checking for any fuel imbalance. If encountering a 'cross-trim' situation, my first action is to balance the wing fuel before taking the next step.
The second step is to follow
oldebloke's recommendations (as per Boeing) of putting in enough rudder to level the control wheel, and to then apply trim to unload the rudder pressure.
The reasoning behind this is that we must assume that the aircraft is correctly rigged (no way to know if it isn't), and with equal wing fuel, the only real disturbance to trimmed flight will be assymetric thrust. Even if the engine indicating parameters (N1, EPR etc.) are exactly matched, the ACTUAL thrust output will vary from engine to engine depending upon their condition, leading to some 'built-in' yaw.
So, follow
oldebloke / Boeing, apply rudder to centre the control wheel, use rudder trim to trim out the rudder force, and take your hands and feet off. If there is now any residual roll tendancy, apply Roll trim as required.
Works for
oldebloke, works for Boeing, works for me
Regards,
Old Smokey