Let410 would have no problem and neither would a twotter or a 1900D.
The airport is just not suited to IFR flights and as such will never be suitable for reliable schedual service. However much people would like to kid themselves.
Unlicense the airfield. Get rid of trumpton. Put a coffee shop in the terminal with local Art for sale and you might be able to keep it running until the runway breaks up again.
Tri-lander to GLA maybe a possibilty unless the head wind gets to much and there is a danger of people loosing the will to live and jumping out half way.