From an immigration viewpoint, being on a 2 year residency visa will not make a difference to your ability to live and work in NZ indefinatley.
The only incentive for taking out permanent residency is that it allows you to travel to and from NZ without the same restrictions.
As you will not have to travel overseas with the Link group this will not be a problem. Whether or not the link recruiters understand this is really your only hurdle.
When you arrive in NZ your
PR/TR Visa will allow you to be issued a residency permit which is actually the mechanism that allows you to stay indefinatly.
With the TR the only limitation is that you either never leave the country, or if you leave make sure you renew the visa(assuming it has since expired)in order to be issued a residency permit when you get back.