I have an idea:
Way back when, high schools back in the Bronx during the depression had two “sessions”. It allowed children to play outside during half of the day (which they don’t get enough of nowdays as is) and learn the other half. With the exception of Davening (which who cares how large the class size is), this can be a possibility.
If this is implemented, then the Beis Yaakov can cut infrastructure & employee costs in almost half; by asking the teachers to remain in school from 7 – 6 (Like many other industries) for a higher wage (lets say 33% higher), they can fire close to half the staff and still save 25% of costs. If they expand class sizes then they can cut even more staff.
I know cutting staff is not a good thing, but its better than not opening!