The flight deck should be off limits to anybody other than those that need to be there (Pilots, engineers, F/A's etc). DAMP, get them in the crew room without interrupting or delaying vital pre flight procedures. Does the legislation include a "no contact or disruption" clause?
When a crew is delayed, stress levels rise and workloads increase to compensate for the reduced time and commercial implications. The potential for error rises dramatically when the crew is late and rushing to make up time. Imagine if they missed some vital pre flight action or entered some erroneous data as a result of "last minute DAMP" and an accident or incident occurred (other than the lockout!). CASA and the DAMPers would have to be a contributing factor.