There are work arounds for unlinking the rudder trim, but I have not been able to really get them to work. I usually trim, then quick tap z/x and the rudder recenters if I had it off center. Like you, I dont trim with rudder off center usually. If I accidentally do, I do as said. With a FFB stick, the cyclic will stay in place, but the rudder pedals are non FFB so they need to be recentered and will have no preceivable trim position.