I would have thought a couple of DHC-8-100's would be somewhat cheaper to lease/purchase than a couple of Fokkers. Getting the right people also will be a headache, not to mention a Part 121 AOC as CASA PNG are currently grossly under staffed. I would be very surprised if this operation ever gets off the ground.
Off the topic a bit, I believe that a new operator has started up in Southern Bougainville (Buin). I believe the company is called BRA ! Operating Islanders and are apparently getting Harbin Y-12's.