Closing BOH for ryanair does not make any problems at all really. If you reduce it to just two sectors a day, you will still have a base captain and base manager to pay, not really value for money for doing so little work.
Just close it for 3 months, and might i add i did say it would be closed for the winter a few months ago.
FR could still provide a service at BOH using aircraft based elsewhere as they do with the entire program at MAN.