Large Family Transfer from Dublin Airport to Killarney

We have a family 16 (grandparents down to 7 year old) and will be traveling to Ireland from the States at the end of March 2026.

What would be the best ways to get to Killarney? We’ve seen options for the AirPort Express to Heuston train station. Short flights from Ryan Air. Private small bus transfers.

The private transfer seems like it is fairly economical and we would appreciate just getting picked up at the airport and dropped off at the entrance of the VRBO.

Has anyone done with a large group? Any dos and don’ts? Prefer one vs another? Looking for any tips. Thanks!