It's been said before on this site, but it's worth repeating: surely with the cost of fuel today being what it is, the economics are there for the main users of PER to kick in towards the cost of adding 500 metres and an ILS to the main runway at KAL?
I'd be guessing that any such outlay when shared among the users of PER would pay for itself in just a few years both in diversions that would no longer be necessary and extra payload/less cost in all that diversion fuel and island destination now carried for ops into PER.