Follow your plan, it sounds fine. When I've hived nucs I move the frames right into their new brood box and leave the entrance open at 1" just like you're planning to do. They orient and go on about their business. The only possible issue I see is if the nuc originated less than 3 miles or so from your bee yard. In that case, some of the foragers could pick up on landmarks and return to the original hive location.