Sounds like a bit of a drama in NI though! However, let's face it, to start a gliding strip froms scratch you only need ~20-30 acres of flat and well-drained land. Surely there must be somewhere suitable???
Old airfields etc ,Ballywalter, surrounded by trees and a quagmire, Ballyhalbert caravan park and building site, Bishopscourt republican area would need armed security, Toome would need even more security, Ballykelly industrial development, Limavady same, there is a small airstrip at Carrickmore the locals tried to kill me there a few times
Fermanagh you would need seaplanes for half the year, Armagh nowhere, Antrim plateau nowhere, Kirkistown racing track, Greencastle caravan park, Nutts Corner, market, race track and chicken farm. Langford Lodge Martin Baker , industrial and farming, Maydown, industrial and police, Cluntoe do you have a spare rockape Sqn? Magaberry prison, Maze IRA skinny fecker of the year shrine plus showgrounds.
The answer is nowhere for winch launch.