MTA could try running the (to 14 St , Chambers Street, or South Ferry), the (to 42 St, Brooklyn Bridge, or Bowling Green), the (to Lefferts Boulevard), and (to 57 St or 71 Av) Friday-Saturday late nights. The , , , and will be the late night expresses those 2 nights a week. The Lefferts shuttle will be replaced by the for those two nights. Every Manhattan trunk will have one express on Friday and Saturday nights (currently every Manhattan trunk has a weekend late night express except the 8th Avenue and Broadway lines).
The on Sunday-Thursday late nights should be extended to 149 St Grand Concourse. The on Sunday-Thursday late nights could possibly be extended to Chambers Street (some late evening s to this now) . The weekend should be extended to Chambers Street after the reopens in Manhattan.
The additional weekend late night service will run from Friday night 11:00PM to 8:00AM Sunday Morning (no more and shuttles running until after 7-8am Sunday mornings)
This is a middle ground between doing nothing and running these service 7 nights a week, it covers the two busiest nights. It would require permanently having a separate Sunday schedule, Monday-Thursday schedule, Friday schedule, and a Saturday schedule.4
MTA currently has a separate Sunday schedule, Monday schedule (until 5am), Tuesday-Thursday schedule, Friday schedule (after 10pm on the , 10:30pm on the , and 11:00pm on the ), and a Saturday schedule on the , and trains. The complete Monday and Friday schedules are only shown in real time and not on the timetables.