I can't see KLM doing a service from EXT. Flybe operate EXT-CDG which is a code share with AF part of AF/KLM group. That gives the whole of the south west a connection anywhere in the world. Flybe also operate their own service to AMS from EXT.
KLM operate feeder services from BRS which covers a huge catchment area within a 1 hours drive.
PLY's runway is just to small to operate from and the catchment area around NQY is just to small for an operator like KLM to be interested in.
Just my own thoughts
CC99