That seems a good option. Which will be easier to reach at about 8am, from the M1, Malahide or Swords Airside?
Malahide will take you at least 15 minutes from M1 - rush hour, schools and then you have to park in DART Car park.
Airside will take about 5 mins from M1 (even though you pass within 1 minute of it - the off ramps don't allow for direct access approaching from or going North).
Easiest way is to get off M1 heading for Airport and head North towards Swords from Airport roundabout - Airside is about 1 Mile from Airport roundabout.