I'm sure RUPA may have some grievances with camp stretchers, that said there is still room to have the team play against some of the better colts teams to at least get a respectable level of competition. As BR mentioned, PNG doesn't quite fit the bill.
A 2 game tournament against NZ would even further the development, or even a mini Rugby Championship each year, have a round robin comp run concurrently to the rugby championship, to save on travel costs have the tournament staged in one country and rotated annually, a GF of 1v2 and 3v4..that's 4 weeks of rugby potentially compressed into 2 or 3 weeks if they opt for midweek matches.