How about this:
Ditmars Blvd to Euclid Ave
Broadway/Fulton Street local
Via Montague Street tunnel with a New connection to Hoyt-Schermerhorn Street.
24/7 or part time
C train to Leffert Blvd via Fulton Street Express.
I like it but instead of following the M10 route, I would send it across 110 street to 5th ave, make a left on 106 street to follow the M106 to its terminal.
Just a crazy idea or not, elinimate the Bx33 and replace it with the Bx17 to Harlem and the Bx21 to Port Morris. Bx33 takes too long especially on the weekend.