Not forgetting LCY to Antwerp, I positioned a crew in to ANR one day and to get back to OST, and this is 20 years ago, they took some kind of train or tram thingy that runs along the coast.
But Ostend is a dump, I lived there for 2.5 years, the sewerage goes straight out so sea so if the wind is blowing in the wrong direction the pong in the toilets can be ... The tap water comes out of the sand dunes full of sand, salt and whatever else, about the most exciting thing about Ostend is the road to Calais ... Don't take the road to Brussels because that's almost as bad!
If I recall correctly they renamed OST adding Bruges, when Ryanair started a route there, now how unusual is that renaming an airport for Ryanair, and whilst Bruges may be a tourist attraction I doubt that it will attract enough travellers from one UK airport to justify a LoCo operation, Ryanair couldn't make it work even with their silly fares.