I was for a while a right seat checked captain in the A320 so I might have done 2 days as Captain in the left, the next day as an FO in the right seat, then back to the left for a few days etc. It isn't a problem.
It doesn't make a difference to me which hand I use to fly although in life I am firmly right handed. I think the bigger problem potentially with swapping between seats is the muscle memory on the go around under stress. An airline (a320) had a captain under training who instead of fire-walling the thrust levers and pulling the nose up did the opposite (as he would have done previously as an FO) Right hand back left hand forward ie chop the thrust and shove the nose down...