Instead of suspending the , route it through the Crosstown Express Portion, terminating at the Hoyt-Schermerhorn Street station by re-utilizing the "ghost" platform.
Lexington Avenue service should be broken into two sections:
the between Woodlawn and 125th Street [terminal on Uptown side], and between 42nd Street & Utica Avenue.
the between Dyre Av & 125th Street [terminal and rerun on Downtown side].
the between Pelham Bay & 125th Street [terminal on uptown side].
The would have to connect passengers between Times Square and Queensboro Plaza with the train broken between Times Sq & Stilwell Avenue, and the 31st Street shuttle.
the can terminate at Queens Plaza and customers who need Manhattan should Xfer at 74th Street to use the for the above scenario (since Queensboro Plaza and Queens Plaza are disjointed).
BTW, what is SAS?
I think I missed a detail that might ground this roleplay.