You are right, I am really lucky with that hall. I read here on GF that Dustyn Alt has access to such a hall and then I searched the web for bike clubs in the surroundings and asked many of them. Two answered me and now I am a member of two clubs
One has its own hall (the one shown at the picture) and the people from the other one train in a school sports hall. They both gave me one date per week where I can enter the hall which is not so much. But I can enter one of the halls on the weekend when there is no other happening. So I can not ride whenever I want but most of the time I can have at least two sessions per week which is very good.
I will try to ride in the second hall tomorrow!
Maybe you can also try to get in contact with some sports clubs. I think it is a compromise but easier to be accepted by your wife