Your two realistic choices are EBOS and EBKT. It is easy to get from the airport to the Ostend train station by bus. Frequent trains to Brugge and Gent. From EBKT to Kortrijk station is easy by taxi or bus, also frequent trains to Brugge and Gent. Ursel is in the middle of the woods, old military airfield, aeroclub runs the place now.
EBKT is probably easier and quicker to get in/out and the airplane is parked within walking distance of the terminal. EBOS is near the coast with all the attractions that come with it.