I say a return of the last W before it was discontinued (Astoria Local/Broadway Local), except it would be continued through the Monyague Street Tunnel after Whitehall with the R to Jay Street Metrotech. The MTA would build a short connector tunnel at Jay Street between the BMT and IND tracks, and the W serves as the Culver Express to Church Avenue, with a peak-direction express extension to Kings Highway. Like the last W, this would be a weekday-only route.