derelicte,
KLM don't operate anything capable of performing in/out of PLH, their smallest aircraft, now, is the F70, something like 84 seats, KLM like to serve a commuter route (for connections purposes) a minimum of 3 times daily, what do you think the chances are of 250 people travelling daily NQY-AMS and vice versa?
As for EXT-AMS, long ago it was tried, I recall, with an Air UK Bandit (Air UK later became KLM), if not a Bandit then a Shed 330, I think they routed/combined it via SOU, with only 18 (ish) seats it didn't pay and, nowadays, KLM serve BRS instead.