Let's bear in mind here that, to get in the Dutch team, Kuipers would have to be better than Edwin Van Der Sar (Man U Number 1) and Maarten Stekelenburg (AFC Ajax Number 1).
Hendo, however, would have to be seen as being better than Shay Given and/or Paddy Kenny in order to play for Ireland.
Basically, if Hendo was Dutch, he'd not be anywhere close to being an international.
As Shay Given is a significantly BETTER keeper than Van der Sar, I'm not sure I entirely follow your point Steve.